---
product_id: 48271698
title: "NATIONAL GEOGRAPHIC Rock Tumbler Grit - 1.49kg Polishing Grit Media for Any Rock Tumbler, Rock & Stone Polisher, Polishes 3.63 - 4.54kg of Rocks"
brand: "blue marble"
price: "116721CFA"
currency: XOF
in_stock: true
reviews_count: 13
category: "Blue Marble"
url: https://www.desertcart.sn/products/48271698-national-geographic-rock-tumbler-grit-1-49kg-polishing-grit-media
store_origin: SN
region: Senegal
---

# Secure screw-top storage Polishes up to 4.5kg rocks 4-stage precision grit system NATIONAL GEOGRAPHIC Rock Tumbler Grit - 1.49kg Polishing Grit Media for Any Rock Tumbler, Rock & Stone Polisher, Polishes 3.63 - 4.54kg of Rocks

**Brand:** blue marble
**Price:** 116721CFA
**Availability:** ✅ In Stock

## Summary

> 🪨 Transform your rocks from rough to remarkable — polish like a pro!

## Quick Answers

- **What is this?** NATIONAL GEOGRAPHIC Rock Tumbler Grit - 1.49kg Polishing Grit Media for Any Rock Tumbler, Rock & Stone Polisher, Polishes 3.63 - 4.54kg of Rocks by blue marble
- **How much does it cost?** 116721CFA with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.sn](https://www.desertcart.sn/products/48271698-national-geographic-rock-tumbler-grit-1-49kg-polishing-grit-media)

## 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

- • **STEM-Approved Fun:** Elevate your geology game with a hands-on science kit that’s as educational as it is addictive.
- • **4-Stage Grit Mastery:** From rough shaping to mirror polish, every rock gets the perfect finish.
- • **Universal Compatibility:** Works seamlessly with all rock tumblers, optimized for National Geographic kits.
- • **Effortless Use & Storage:** Wide-mouth containers with screw-tops keep grit fresh and measuring simple.
- • **Heavy-Duty Polishing Power:** Refill pack handles up to 4.5kg of stones, gems, and glass with ease.

## Overview

The NATIONAL GEOGRAPHIC Rock Tumbler Grit is a premium 4-stage silicon carbide polishing media set designed to refine and polish up to 4.5kg of rocks, gems, and glass. Compatible with all tumblers and packaged for easy use and storage, it offers a professional-grade finish while promoting hands-on geological learning for ages 8 and up.

## Description

NATIONAL GEOGRAPHIC Rock Tumbler Grit - 1.49kg Polishing Grit Media for Any Rock Tumbler, Rock & Stone Polisher, Polishes 3.63 - 4.54kg of Rocks : desertcart.co.uk: Home & Kitchen

Review: Perfect size for the rock tumbler! - Exactly what I needed, more grit for my tumbler! I recently got some of my own beach rocks; quartz and serpentine, possibly some granite, and I needed these to tumble away! Good size, easy to use, functions as it should, measuring spoon and instructions made it easy to use. Think this is probably fun for kids, but definitely is for adults!
Review: Do the job well - I was a bit concerned by some of the negative comments but am so glad I went ahead and bought the product. It works very well and I will buy again.

## 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 9 kg 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 tumbling grit refill kit works with all rock polishers. For best results, use with National Geographic 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
- HIGH-QUALITY EDUCATIONAL TOYS - We're proud to make the highest quality hands-on science toys, and all our products are backed by exceptional service. If your experience is less than stellar, let us know and we'll make things right!

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B01MRKI4W0 |
| Age Range Description | 8 years and up |
| Best Sellers Rank | 96,826 in Toys & Games ( See Top 100 in Toys & Games ) 1,035 in Educational Science Kits |
| Brand Name | Blue Marble |
| Colour | Black |
| Customer Reviews | 4.6 out of 5 stars 14,024 Reviews |
| Educational Objective | Promote geological knowledge and provide practical learning experiences related to rocks and minerals |
| Global Trade Identification Number | 00816448020636 |
| Included Components | 10 mL Grit Scoop, 4 Stages of Rock Polishing Grit, Rock Tumbling Instructions |
| Indoor Outdoor Usage | Indoor |
| Is Assembly Required | No |
| Item Dimensions | 14 x 14 x 10.8 centimetres |
| Item Type Name | Rock Tumbler Grit - Rock Polishing Grit Media |
| Item Weight | 1.78 Kilograms |
| Manufacturer | National Geographic |
| Manufacturer Part Number | NGBULKGRIT |
| Manufacturer Warranty Description | We're proud to make the highest quality products which are backed by exceptional service. |
| Manufacturer recommended age | 8 years and up |
| Material Type | Carbide of Silicon |
| Model Number | NGBULKGRIT |
| Number of Packs | 1 |
| Number of Players | 1 |
| Operation Mode | Manual |
| Set Name | Stone Bite Set |
| Size | M |
| Sub Brand | National Geographic |
| Supported Battery Types | No batteries required |
| Theme | Science |
| UPC | 816448020636 |
| Unit Count | 1.0 count |

## Images

![NATIONAL GEOGRAPHIC Rock Tumbler Grit - 1.49kg Polishing Grit Media for Any Rock Tumbler, Rock & Stone Polisher, Polishes 3.63 - 4.54kg of Rocks - Image 1](https://m.media-amazon.com/images/I/81+X8uILF3L.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

### ⭐⭐⭐⭐⭐ Perfect size for the rock tumbler!
*by K***M on 17 October 2025*

Exactly what I needed, more grit for my tumbler! I recently got some of my own beach rocks; quartz and serpentine, possibly some granite, and I needed these to tumble away! Good size, easy to use, functions as it should, measuring spoon and instructions made it easy to use. Think this is probably fun for kids, but definitely is for adults!

### ⭐⭐⭐⭐⭐ Do the job well
*by A***R on 12 July 2023*

I was a bit concerned by some of the negative comments but am so glad I went ahead and bought the product. It works very well and I will buy again.

### ⭐⭐⭐⭐⭐ Good product
*by R***T on 27 August 2025*

Really satisfied with the product. I'm still learning but for now it's doing fine.

## 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 Senegal*
*Store origin: SN*
*Last updated: 2026-09-16*