---
product_id: 256324920
title: "Blue Marble National Geographic (Bulk Grit Media) - Rock Tumbler Grit - 1.5kgs Rock Polishing Grit Media, Works with any Rock Tumbler, Rock Polisher, Stone Polisher, Polishes 8-4.5kg of Rocks"
brand: "blue marble"
price: "428.84 DT"
currency: TND
in_stock: true
reviews_count: 5
url: https://www.desertcart.tn/products/256324920-blue-marble-national-geographic-bulk-grit-media-rock-tumbler-grit
store_origin: TN
region: Tunisia
---

# 1.5 kg bulk pack for 8-10 lbs rocks Includes precise 10 mL grit scoop 4-stage silicon carbide grit system Blue Marble National Geographic (Bulk Grit Media) - Rock Tumbler Grit - 1.5kgs Rock Polishing Grit Media, Works with any Rock Tumbler, Rock Polisher, Stone Polisher, Polishes 8-4.5kg of Rocks

**Brand:** blue marble
**Price:** 428.84 DT
**Availability:** ✅ In Stock

## Summary

> ✨ Transform Rough Rocks into Polished Masterpieces with Every Spin!

## Quick Answers

- **What is this?** Blue Marble National Geographic (Bulk Grit Media) - Rock Tumbler Grit - 1.5kgs Rock Polishing Grit Media, Works with any Rock Tumbler, Rock Polisher, Stone Polisher, Polishes 8-4.5kg of Rocks by blue marble
- **How much does it cost?** 428.84 DT with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.tn](https://www.desertcart.tn/products/256324920-blue-marble-national-geographic-bulk-grit-media-rock-tumbler-grit)

## Best For

- blue marble enthusiasts

## Why This Product

- Trusted blue marble brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **STEM-Approved Quality:** Backed by National Geographic’s trusted educational brand for hands-on science fun
- • **Universal Compatibility:** Works seamlessly with any rock tumbler, maximizing your investment
- • **Precision Polishing Power:** Four-stage grit refines rough stones to museum-quality shine
- • **Bulk Supply for Serious Tumblers:** 1.5 kg grit media polishes up to 10 lbs of rocks, gems, and glass
- • **Effortless Measurement & Storage:** Wide-mouth containers with screw-top lids keep grit fresh and easy to use

## Overview

The Blue Marble National Geographic Rock Tumbler Grit Bulk Pack offers a premium 4-stage silicon carbide grit system designed to polish 8-10 pounds of rocks, gems, and glass. Compatible with all rock tumblers, this 1.5 kg refill kit includes a precise 10 mL scoop and secure storage containers, delivering professional-grade results backed by National Geographic’s STEM educational expertise.

## Description

The National Geographic Rock Tumbler Grit Bulk Pack contains over 3 pounds of rock polishing grit, compatible with any rock tumbler!This Kit Includes:- 4 Stages of Rock Polishing Grit- 1 10 mL Grit Scoop- Rock Tumbling InstructionsThis four-stage silicon carbide grit for rock tumbling system is the ideal way to give rough rocks a smooth, polished look. The first rock polishing stage smooths rough edges and provides initial shaping. The second stage smooths the rock surfaces even more. The third stage provides a strong pre-polish, followed by the fourth stage which completes the grit polishing process.The 10 mL scoop in the grit refill kit ensures accurate grit measurements for every stage, allowing you maximize your grit usage for up to 10 pounds of rocks!This grit refill for rock tumbler pack is compatible with any rock tumbler on the market. But for best results, use this rock tumbler grit and polish refill with National Geographic rock tumblers and rock tumbling supplies, including ceramic media and GemFoam.National Geographic Toys makes the highest quality hands-on science toys, and all products are backed by exceptional service.About the National Geographic Society: With a mission to inspire people to care about the planet, the National Geographic Society is one of the world’s largest nonprofit scientific and educational organizations.

Review: Helps Poshing - It helps shaping stones too..it is a little sound and I'm living 2floor so I put a box on it to make the noise more silent
Review: Scheint gut zu funktionieren - Artikel wie beschrieben, gute Transportverpackung, gerne wieder

## Features

- HIGH QUALITY – This rock polisher grit refill pack comes with enough high-quality silicon carbide grit to put a dazzling polish on approximately 8-10 lbs. of rocks, gems, glass, and more
- EASY TO USE FOUR-STAGE ROCK GRIT - The first rock tumbling grit stage provides initial shaping, the second smooths rock surfaces, the third pre-polishes rocks, and the fourth provides the final polish
- COMPATIBLE WITH ALL TUMBLERS - This complete 4-step rock tumbler grit refill kit works with all rock tumblers. For best results, use with National Geographic Rock Tumblers and rock tumbling supplies
- EASY TO MEASURE AND STORE - Each rock tumbling grit stage is packaged in a wide-mouth container with secure, screw-top closure
- SATISFACTION GUARANTEED – The National Geographic STEM series provides high-quality products that are a whole lot of fun! If your experience is anything less than extraordinary, let us know so we can make it right for you

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B01MRKI4W0 |
| Age Range Description | 14 years and up |
| Best Sellers Rank | #69,807 in Kitchen ( See Top 100 in Kitchen ) #859 in Tumblers & Water Glasses |
| Brand Name | Blue Marble |
| Color | Black |
| Customer Reviews | 4.7 out of 5 stars 14,015 Reviews |
| Educational Objective | Learn About Rock Tumbling |
| Global Trade Identification Number | 00816448020636 |
| Included Components | 10 mL Grit Scoop, 4 Stages of Rock Polishing Grit, Rock Tumbling Instructions |
| Indoor Outdoor Usage | Indoor |
| Is Assembly Required | No |
| Item Dimensions | 14 x 14 x 10.8 centimeters |
| Item Type Name | with any Rock Tumbler, Rock Polisher, Stone Polisher, Polishes 8-10 Pounds of Rocks |
| Item Weight | 1.78 Kilograms |
| Manufacturer | JMW Sales, Inc. |
| Manufacturer Part Number | NGBULKGRIT |
| Manufacturer recommended age | 8 years and up |
| Material Type | glass, glass quartz glass carbide |
| Model Number | NGBULKGRIT |
| Number of Packs | 1 |
| Number of Players | 1 |
| Operation Mode | Manual |
| Power Source | battery_powered |
| Set Name | Bite Set with Stone |
| Size | M |
| Sub Brand | NATIONAL GEOGRAPHIC |
| Subject Character | no subject character |
| Supported Battery Types | No batteries required |
| Theme | Science |
| UPC | 816448020636 |
| Unit Count | 1.0 Count |

## Images

![Blue Marble National Geographic (Bulk Grit Media) - Rock Tumbler Grit - 1.5kgs Rock Polishing Grit Media, Works with any Rock Tumbler, Rock Polisher, Stone Polisher, Polishes 8-4.5kg of Rocks - Image 1](https://m.media-amazon.com/images/I/91eEtrXZOeL.jpg)

## Questions & Answers

**Q: How many oz is in each container?**
A: 1 Coarse-16oz.  2 Medium-13oz.  3 Pre-polish-12oz.  4 Polish-11.5 oz.

**Q: I just opened this and finished with grit one,  went to put grit 2 in and bottle open and 1/2 full. How do I contact seller?**
A: I would go through Amazon to get an answer for your problem.

**Q: Can it be used together ?**
A: Each grit is a different fineness intended for a specific purpose. We do not recommend using them at the same time.  We do recommend 1 TBS grit per per 1 LB rocks, at each cycle. For further information please contact us at help@natgeotoys.com.

**Q: After each step for the rocks in the kit, my rocks dry with a dull white finish.  It doesn't show when it is wet. Am I doing something wrong?**
A: No.  I find that after tumbling with the finest grit after the last step... and thoroughly allowing the rocks to dry, a nice coat of wax or oil brings out the color beautifully.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Helps Poshing
*by F***M on 15 November 2021*

It helps shaping stones too..it is a little sound and I'm living 2floor so I put a box on it to make the noise more silent

### ⭐⭐⭐⭐⭐ Scheint gut zu funktionieren
*by J***M on 14 May 2026*

Artikel wie beschrieben, gute Transportverpackung, gerne wieder

### ⭐⭐⭐⭐⭐ Muy satisfecha
*by A***X on 13 July 2025*

El proceso de pulir piedras es algo largo, pero el producto hace su labor. Viene suficiente cantidad para varias tandas y es muy sencillo de usar, ya que cada paso esta numerado.

## Frequently Bought Together

- Blue Marble National Geographic Rock Tumbler Grit and Polish Refill Kit - Tumbling Grit Media, Polish Up to 20 lbs. of Rocks, Works with Any Rock Polisher, Rock Tumbler Supplies
- National Geographic Rock Tumbler Kit – Hobby Edition Includes Rough Gemstones, and 4 Polishing Grits, Great STEM Science Kit for Geology Enthusiasts, Rock Polisher for Kids and Adults
- UU UNIHOM 3 lbs Bulk Rough Madagascar Stones Mix Large 1" Natural Raw Stones Crystal for Tumbling, Cabbing, Fountain Rocks, Decoration,Polishing, Wire Wrapping, Wicca Reiki Crystal Healing

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*Product available on Desertcart Tunisia*
*Store origin: TN*
*Last updated: 2026-10-07*