--- product_id: 573175042 title: "Ravensburger GraviTrax: FlexTube Accessory| STEM Toy for Kids Ages 8 and Up | Compatible with All GraviTrax Systems | Ranked No.1 Marble Run System in The U.S" brand: "ravensburger" price: "14.36 DT" currency: TND in_stock: true url: https://www.desertcart.tn/products/573175042-ravensburger-gravitrax-flextube-accessory-stem-toy-for-kids-ages-8 store_origin: TN region: Tunisia --- # Connects multi-level tracks seamlessly 100% compatible with all GraviTrax sets Harnesses gravity & magnetism for dynamic play Ravensburger GraviTrax: FlexTube Accessory| STEM Toy for Kids Ages 8 and Up | Compatible with All GraviTrax Systems | Ranked No.1 Marble Run System in The U.S **Brand:** ravensburger **Price:** 14.36 DT **Availability:** ✅ In Stock ## Summary > 🛠️ Build Beyond Boundaries with GraviTrax FlexTube! ## Quick Answers - **What is this?** Ravensburger GraviTrax: FlexTube Accessory| STEM Toy for Kids Ages 8 and Up | Compatible with All GraviTrax Systems | Ranked No.1 Marble Run System in The U.S by ravensburger - **How much does it cost?** 14.36 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/573175042-ravensburger-gravitrax-flextube-accessory-stem-toy-for-kids-ages-8) ## Best For - ravensburger enthusiasts ## Why This Product - Trusted ravensburger brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **STEM-Powered Fun:** Engage kids 8+ with hands-on science, engineering, and physics exploration. - • **Elevate Your Track Game:** FlexTube bridges different track heights for endless design possibilities. - • **Universal Compatibility:** Works flawlessly with every GraviTrax set—expand your marble run without limits. - • **Award-Winning Innovation:** Join millions who trust the #1 U.S. marble run system for creative play. - • **The Ultimate Gift for Builders:** Perfect for curious minds craving interactive, educational entertainment. ## Overview The Ravensburger GraviTrax FlexTube is a versatile STEM accessory that connects different track levels, enhancing the award-winning GraviTrax marble run system. Designed for kids 8 and up, it encourages creative engineering and scientific experimentation, compatible with all GraviTrax sets to extend play and learning. ## Description Connect different levels of your tracks with the “GraviTrax FlexTube” and keep the fun racing along!What comes up, must come down, and with the “GraviTrax FlexTube” you’ll easily change your marble’s direction and track level in a race to the finish! Four FlexTubes are included, and each may be configured in a 60-degree angle, u-shaped or s-shaped tubes to add extra stunts to your amazing marble run. The set also includes 4 height tiles to raise your run even higher! It’s a snap to combine “FlexTube” with any “GraviTrax Starter-Set” to experience the power of gravity and educational fun today!What makes a great toy? GraviTrax checks all the boxes! It’s a creative, modular, expandable track system that challenges children to use their imagination to design and build their own marble runs! Electronic-free, GraviTrax construction sets use STEM-friendly concepts while building critical thinking and problem-solving skills. Completely open-ended, every GraviTrax set has a boredom-busting variety of play options for hours of fascinating fun. Once the basics are mastered, simply add expansion sets and accessories to propel those metal marbles around the tricked-out track of your dreams!Comes complete with 4 FlexTubes, 4 height tiles and instructions. Lasting durability for girls and boys ages 8 and up, it’s the learning toy children (and savvy adults) return to over and over again! ## Features - [GraviTrax: FlexTube] Connect different levels of your tracks with the “GraviTrax FlexTube” and keep the fun racing along! - [INNOVATIVE] The GraviTrax interactive track system allows you to design and build your own race tracks and experiment with gravity, magnetism, kinetics - [STEM TOY] Boys and girls ages 8 and up can experience educational and science play. The franchise has sold over 15.5 million units worldwide and has ranked as the No.1 marble run system in the U.S., according to the NPD Group. - [COMPATIBLE] Easily extend play time - All sets are compatible and functional with all GraviTrax systems - [GREAT GIFT] GraviTrax is an a ideal holiday and birthday gift for creative, curious kids and adults who love to build. ## Images ![Ravensburger GraviTrax: FlexTube Accessory| STEM Toy for Kids Ages 8 and Up | Compatible with All GraviTrax Systems | Ranked No.1 Marble Run System in The U.S - Image 1](https://m.media-amazon.com/images/I/71fTbKDMU-L.jpg) ![Ravensburger GraviTrax: FlexTube Accessory| STEM Toy for Kids Ages 8 and Up | Compatible with All GraviTrax Systems | Ranked No.1 Marble Run System in The U.S - Image 2](https://m.media-amazon.com/images/I/71ZXHBt-UyL.jpg) ![Ravensburger GraviTrax: FlexTube Accessory| STEM Toy for Kids Ages 8 and Up | Compatible with All GraviTrax Systems | Ranked No.1 Marble Run System in The U.S - Image 3](https://m.media-amazon.com/images/I/71OXtT+e7+L.jpg) ![Ravensburger GraviTrax: FlexTube Accessory| STEM Toy for Kids Ages 8 and Up | Compatible with All GraviTrax Systems | Ranked No.1 Marble Run System in The U.S - Image 4](https://m.media-amazon.com/images/I/61YYYWtF9nL.jpg) ![Ravensburger GraviTrax: FlexTube Accessory| STEM Toy for Kids Ages 8 and Up | Compatible with All GraviTrax Systems | Ranked No.1 Marble Run System in The U.S - Image 5](https://m.media-amazon.com/images/I/51fF3EauTVL.jpg) ## Available Options This product comes in different **Style** options. ## Frequently Bought Together - Ravensburger GraviTrax: FlexTube Accessory| STEM Toy for Kids Ages 8 and Up | Compatible with All GraviTrax Systems | Ranked No.1 Marble Run System in The U.S - Ravensburger GraviTrax: Jumper Accessory| STEM Toy for Kids Ages 8 and Up | Compatible with All GraviTrax Systems | Ranked No.1 Marble Run System in The U.S - Ravensburger GraviTrax: Scoop Accessory | Marble Run & STEM Toy for Boys & Girls Ages 8 & Up | Accessory for 2019 Toy of The Year Finalist --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.tn/products/573175042-ravensburger-gravitrax-flextube-accessory-stem-toy-for-kids-ages-8](https://www.desertcart.tn/products/573175042-ravensburger-gravitrax-flextube-accessory-stem-toy-for-kids-ages-8) --- *Product available on Desertcart Tunisia* *Store origin: TN* *Last updated: 2026-06-09*