--- product_id: 454336197 title: "Discover with Dr. Cool Replacement Rock Tumbler Barrel for National Geographic Professional Series - 2Lb" brand: "discover with dr. cool" price: "R2875" currency: ZAR in_stock: true reviews_count: 5 category: "Discover With Dr. Cool" url: https://www.desertcart.co.za/products/454336197-discover-with-dr-cool-replacement-rock-tumbler-barrel-for-national store_origin: ZA region: South Africa --- # Compatible with National Geographic Professional Series Dedicated barrel avoids cross-contamination of grits 2 lb capacity for precise small batch polishing Discover with Dr. Cool Replacement Rock Tumbler Barrel for National Geographic Professional Series - 2Lb **Brand:** discover with dr. cool **Price:** R2875 **Availability:** ✅ In Stock ## Summary > ✨ Elevate your gem game with precision polishing power! ⚙️ ## Quick Answers - **What is this?** Discover with Dr. Cool Replacement Rock Tumbler Barrel for National Geographic Professional Series - 2Lb by discover with dr. cool - **How much does it cost?** R2875 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.co.za](https://www.desertcart.co.za/products/454336197-discover-with-dr-cool-replacement-rock-tumbler-barrel-for-national) ## Best For - discover with dr. cool enthusiasts ## Why This Product - Trusted discover with dr. cool brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Polish Like a Pro:** Use this dedicated barrel for the final polish step to achieve flawless, showroom-quality shine without scratches. - • **Seamless Compatibility:** Designed specifically for National Geographic and Discover with Dr. Cool Professional Tumblers—no guesswork, just perfect fit. - • **STEM-Approved Precision:** Elevate your hobby with a tool trusted by educators and enthusiasts alike, blending science with creativity. - • **Durable Glass Construction:** Robust glass material ensures longevity and consistent performance through countless polishing cycles. - • **Perfect Size, Perfect Results:** 2-pound capacity ideal for small, controlled batches—maximize your gemstone brilliance every time. ## Overview The Discover with Dr. Cool Replacement Rock Tumbler Barrel is a 2-pound capacity glass barrel designed exclusively for the final polishing stage in National Geographic Professional Series rock tumblers. Its dedicated use prevents grit contamination, ensuring a flawless, scratch-free finish on gemstones. Compatible, durable, and STEM-approved, it’s the essential upgrade for hobbyists seeking professional-grade results. ## Description Safety Warning No Warning Applicable Review: Good rock tumbler barrel - Good rock tumbler barrel. Great 2 lb size for smaller tumbles. Review: Works great - Is wider than I thought but great more rocks ## Features - Polishing barrel allows you to polish like a pro. We recommend having a dedicated barrel that is only used for the final step in the polishing process to avoid leaving any remnants of rougher grits that might scratch your gemstones and diminish the final polish. - Compatible with national geographic professional rock tumbler and discover with dr. Cool professional rock tumbler - International products have separate terms, are sold from abroad and may differ from local products, including fit, age ratings, and language of product, labeling or instructions. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B077JGMBJJ | | Age Range Description | Adult | | Age range (description) | Adult | | Best Sellers Rank | 111,938 in Business, Industry & Science ( See Top 100 in Business, Industry & Science ) 74 in Tumbling Media | | Brand | Discover with Dr. Cool | | Brand Name | Discover with Dr. Cool | | Customer Reviews | 4.6 out of 5 stars 505 Reviews | | Educational Objective | STEM | | Included Components | Handle, Lid | | Is Assembly Required | No | | Item Dimensions | 14 x 14 x 14 centimetres | | Item Weight | 1.39 Pounds | | Item dimensions L x W x H | 14 x 14 x 14 centimetres | | Item weight | 1.39 Pounds | | Manufacturer | JMW Sales, Inc. | | Manufacturer Part Number | PROBARREL | | Manufacturer recommended age | 0 months and up | | Material Type | Glass | | Model Number | PROBARREL | | Number of Items | 1 | | Number of Packs | 1 | | Size | 2 pounds | | Sub Brand | Discover with Dr. Cool | | Theme | Birthday, Christmas | | UPC | 816448023392 | | Unit Count | 1.0 count | ## Product Details - **Brand:** Discover with Dr. Cool - **Theme:** Christmas, Birthday - **Recommended uses for product:** Home - **Shape:** Round - **Pattern:** Geometric ## Images ![Discover with Dr. Cool Replacement Rock Tumbler Barrel for National Geographic Professional Series - 2Lb - Image 1](https://m.media-amazon.com/images/I/51Uj4itNpGL.jpg) ![Discover with Dr. Cool Replacement Rock Tumbler Barrel for National Geographic Professional Series - 2Lb - Image 2](https://m.media-amazon.com/images/I/618OsVazlmL.jpg) ![Discover with Dr. Cool Replacement Rock Tumbler Barrel for National Geographic Professional Series - 2Lb - Image 3](https://m.media-amazon.com/images/I/815-aYvi8bL.jpg) ![Discover with Dr. Cool Replacement Rock Tumbler Barrel for National Geographic Professional Series - 2Lb - Image 4](https://m.media-amazon.com/images/I/812hULuYAfL.jpg) ![Discover with Dr. Cool Replacement Rock Tumbler Barrel for National Geographic Professional Series - 2Lb - Image 5](https://m.media-amazon.com/images/I/71FjWayKs4L.jpg) ## Questions & Answers **Q: Is the metal on this barrel stainless steel?** A: I've been running this barrel for 5 weeks now and seems to be running good. Metal appears to be stainless steel to me since it seems to be heavier than what aluminum would be. **Q: How to assemble Barrel** A: It is assembled. Tub and lid. May have to screw on knob to lid. **Q: where is this made?** A: Our tumbler barrels are manufactured in China. **Q: I am looking for a 3 lb barrel for a national geographic rock tumbler. Fo you have any idea where to find one.** A: Please contact help@thinkbluemarble.com for parts under warranty. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Good rock tumbler barrel *by G***R on 3 September 2026* Good rock tumbler barrel. Great 2 lb size for smaller tumbles. ### ⭐⭐⭐⭐⭐ Works great *by A***R on 23 January 2023* Is wider than I thought but great more rocks ### ⭐⭐⭐⭐⭐ It does tumble *by B***S on 17 May 2025* Good for small batches ## Frequently Bought Together - Discover with Dr. Cool Replacement Rock Tumbler Barrel for National Geographic Professional Series Tumbler and Hobby Series Tumblers, 2 Pound Rock Polisher Barrel with Leak-Proof Lid - 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 - 3 Lb. Extra Large Capacity Barrel with 3-Speed Motor & 9-Day Timer, Kit Includes Rocks for Tumbling and Rock Polisher Grit, Rock Tumbler for Adults and Kids --- ## 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.co.za/products/454336197-discover-with-dr-cool-replacement-rock-tumbler-barrel-for-national](https://www.desertcart.co.za/products/454336197-discover-with-dr-cool-replacement-rock-tumbler-barrel-for-national) --- *Product available on Desertcart South Africa* *Store origin: ZA* *Last updated: 2026-09-30*