---
product_id: 37710951
title: "NATIONAL GEOGRAPHIC Rock Tumbler Grit and Polish Refill Kit - Tumbling Grit Media, Polish Up to 20 lbs. of Rocks, Works with any Rock Polisher & Tumbler Supplies"
brand: "blue marble"
price: "VT24661"
currency: VUV
in_stock: true
reviews_count: 13
category: "Blue Marble"
url: https://www.desertcart.vu/products/37710951-national-geographic-rock-tumbler-grit-and-polish-refill-kit-tumbling
store_origin: VU
region: Vanuatu
---

# Polishes up to 20 lbs. rocks Universal tumbler compatibility 4-stage precision grit system NATIONAL GEOGRAPHIC Rock Tumbler Grit and Polish Refill Kit - Tumbling Grit Media, Polish Up to 20 lbs. of Rocks, Works with any Rock Polisher & Tumbler Supplies

**Brand:** blue marble
**Price:** VT24661
**Availability:** ✅ In Stock

## Summary

> ✨ Transform your stones, transform your space! ✨

## Quick Answers

- **What is this?** NATIONAL GEOGRAPHIC Rock Tumbler Grit and Polish Refill Kit - Tumbling Grit Media, Polish Up to 20 lbs. of Rocks, Works with any Rock Polisher & Tumbler Supplies by blue marble
- **How much does it cost?** VT24661 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.vu](https://www.desertcart.vu/products/37710951-national-geographic-rock-tumbler-grit-and-polish-refill-kit-tumbling)

## 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

- • **Bulk Polish Power:** Refill kit handles up to 20 lbs. of rocks, gems, and glass—because your collection deserves the best.
- • **Award-Winning Quality:** From the makers of Toy of the Year, trusted for sparking creativity and precision craftsmanship.
- • **Quad-Phase Perfection:** Four distinct grit stages sculpt, smooth, pre-polish, and shine your stones to museum-quality brilliance.
- • **Plug & Play Compatibility:** Seamlessly works with any rock tumbler, making upgrades and refills effortless.
- • **Secure & Organized Storage:** Wide-mouth, screw-top containers keep your grit fresh and ready for your next creative session.

## Overview

The NATIONAL GEOGRAPHIC Rock Tumbler Grit and Polish Refill Kit offers a high-quality, four-stage silicon carbide grit system designed to polish up to 20 lbs. of rocks, gems, and glass. Compatible with all rock tumblers, it comes in secure, easy-to-use containers and is produced by an award-winning brand known for educational and creative excellence.

## Description

desertcart.com: NATIONAL GEOGRAPHIC Rock Tumbler Grit and Polish Refill Kit - Tumbling Grit Media, Polish Up to 20 lbs. of Rocks, Works with any Rock Polisher & Tumbler Supplies : Industrial & Scientific

Review: Good purchase - Great tumbler. Use it frequently with no problems.
Review: Great product - Worked great to tumble to a fine polish

## Features

- HIGH QUALITY - This rock polisher grit refill pack comes with enough high-quality silicon carbide grit to put a dazzling polish on up to 20 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.
- AWARD-WINNING PRODUCTS - Blue Marble, winner of the Toy Association's prestigious Toy of the Year Award, proudly develops products that foster education, imagination, and creativity, with a U.S. support team to ensure a stellar experience!

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B01MRKI4W0 |
| Best Sellers Rank | #1,311 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #1 in Tumbling Media |
| Customer Reviews | 4.6 4.6 out of 5 stars (18,536) |
| Is Discontinued By Manufacturer | No |
| Item Weight | 3.92 pounds |
| Item model number | NGBULKGRIT |
| Language | English |
| Manufacturer | JMW Sales, Inc. |
| Manufacturer recommended age | 14 years and up |
| Product Dimensions | 5.5 x 5.5 x 4.25 inches |
| Release date | September 17, 2021 |

## Images

![NATIONAL GEOGRAPHIC Rock Tumbler Grit and Polish Refill Kit - Tumbling Grit Media, Polish Up to 20 lbs. of Rocks, Works with any Rock Polisher & Tumbler Supplies - Image 1](https://m.media-amazon.com/images/I/91eEtrXZOeL.jpg)

## Available Options

This product comes in different **Style** options.

## 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

### ⭐⭐⭐⭐⭐ Good purchase
*by S***. on January 21, 2026*

Great tumbler. Use it frequently with no problems.

### ⭐⭐⭐⭐⭐ Great product
*by B***R on February 3, 2026*

Worked great to tumble to a fine polish

### ⭐⭐⭐⭐⭐ Decent Value for Hobbyist
*by L***S on January 21, 2026*

These are the same grits that come with the tumbler kit. The scoop that comes with it is a nice addition. I've found that some grits get used faster than others, so it may be worthwhile to find a supplier that sells individual grits. Depending on where you find your rocks, you may find that some of the heavier grits are not needed as much as the finer grits. Most rocks I've polished came from riverbeds and are fairly smooth to start with. In my experience, you can start with the 3rd grit on these and still get the desired results in less time since you can skip the first grit or two which is about 2 weeks of tumbling. Another tip, get some dishes like cake pans or casserole dishes at the dollar store and pour the water/grit from the tumbler into them and let the water evaporate. I have one pan for each grit. You can then reuse the media several times before discarding it.

## 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 Vanuatu*
*Store origin: VU*
*Last updated: 2026-03-15*