Can this be used to tumble glass to make sea glass?

Yes! I have a spot where I find lots of shards of glass and rare colors but they just aren’t “cooked” enough. I got the tumbler to finish them. The glass I have is real sea glass not fake nor bottles I break (which I have never done and won’t because I like that I find my glass and know it has a story from whence it came!) I have found it along beaches and rivers but it just needed some extra time to be perfect but because of the color rarity I wasn’t going to toss it back!

Where can I buy more grit?

Amazon (there are alternatives if you want to search for a specific one you need: coarse (60/90 grit), medium (150/220 grit), fine (500 grit), rock polish (TXP aluminum oxide) but below are two choices that will contain all you’d need, are approx the same lbs of material, and will work equally well): https://www.amazon.com/dp/B01MRKI4W0/ref=cm_sw_r_cp_api_i_8luBDbAX0440H https://www.amazon.com/dp/B07PYFGT44/ref=cm_sw_r_cp_api_i_SkuBDbZFZBTVW

How many pounds/ounces of rocks can you put into the barrel with grit for tumbling?

The Rock Tumbler can hold 1lb (16oz) of rocks in the barrel with the grit for tumbling.Thank you for your inquiry!

How long does it take from start to finish? And can you use any rocks or only the ones that come with it

Each grade of sand is a different grit. About 3 weeks and one extra week to polish. You can run any rocks even ones that you find.

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💎 Polish your passion, rock your world!

BUILT TO ENDURE - Robust motor and leak-proof barrel ensure quiet, reliable tumbling session after session.
COMPLETE ALL IN ONE KIT - Everything you need—rocks, polishing grit, and jewelry fastenings—to start crafting immediately.
GUARANTEED SATISFACTION - Backed by National Geographic’s trusted quality and customer-first guarantee for peace of mind.
STEM LEARNING MEETS FUN - Step-by-step instructions and a colorful guide turn geology into an engaging educational adventure.
EFFORTLESS GEMSTONE CREATION - Transform rough stones into polished gems with ease—perfect for sparking lifelong hobbies.

The National Geographic Starter Rock Tumbler Kit is a durable, leak-proof rock polisher designed for kids 8+ and beginners. It includes a powerful motor, a rubber-lined barrel for quiet operation, ½ pound of rough stones featuring nine gemstone varieties, four-stage polishing grit, and jewelry fastenings. This all-in-one STEM kit combines hands-on geology education with creative fun, backed by a satisfaction guarantee.

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515.66 DT

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Product Dimensions	27.9 x 13.2 x 30.48 cm; 1.9 kg
Manufacturer recommended age	8 years and up
Item model number	NGTUMBLER2
Educational Objective(s)	Geology, Process Understanding, Critical Thinking, Scientific Inquiry
Language:	German
Number of Puzzle Pieces	30
Assembly Required	No
Batteries Required?	No
Batteries Included?	No
Material Type(s)	Silicone
Material Care Instructions	See Included Manual
Remote Control Included?	No
Radio Control Suitability	Home, Travel
Color	Original Version
Release date	13 October 2017
ASIN	B01I56RV0C

NATIONAL GEOGRAPHIC Starter Rock Tumbler Kit - Durable Leak-Proof Rock Polisher for Kids - Complete Rock Tumbling Kit - Geology Hobby Science Kit, Rocks and Crystals for Kids, A Great STEM Activity

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