---
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: "A$97"
currency: AUD
in_stock: true
reviews_count: 13
category: "Blue Marble"
url: https://www.desertcart.com.au/products/37710951-national-geographic-rock-tumbler-grit-and-polish-refill-kit-tumbling
store_origin: AU
region: Australia
---

# 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:** A$97
**Availability:** ✅ In Stock

## Summary

> ✨ Transform your stones, transform your story! ⚡

## 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?** A$97 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.com.au](https://www.desertcart.com.au/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 the Toy of the Year, ensuring educational fun meets professional polish.
- • **Quad-Phase Perfection:** Four distinct grit stages sculpt, smooth, pre-polish, and shine for museum-quality results.
- • **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 developed by an award-winning brand known for fostering creativity and education.

## 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 quality. - My first experience with a rock tumbler and I love it. Works just as explained in the directions.
Review: My first run outcome - Im a kid again with this stuff! Easy to use, idiot proof instructions! Great outcomes.

## 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 | #1,220 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #1 in Tumbling Media |
| Customer Reviews | 4.6 4.6 out of 5 stars (18,466) |
| 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)

## 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 quality.
*by J***E on December 19, 2025*

My first experience with a rock tumbler and I love it. Works just as explained in the directions.

### ⭐⭐⭐⭐⭐ My first run outcome
*by B***T on November 30, 2025*

Im a kid again with this stuff! Easy to use, idiot proof instructions! Great outcomes.

### ⭐⭐⭐⭐⭐ excelente
*by G***S on January 2, 2026*

excelente producto

## 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
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- 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 Australia*
*Store origin: AU*
*Last updated: 2026-01-25*