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NATIONAL GEOGRAPHIC Rock Tumbler Grit - 3.28 Pounds Rock Polishing Grit Media, Works with any Rock Tumbler, Rock Polisher, Stone Polisher, Polishes 8-10 Pounds of Rocks

4.7 out of 5 stars 5,847 ratings

Price: S$105.43
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  • HIGH QUALITY – This rock polisher grit refill pack comes with enough high-quality silicon carbide grit to put a dazzling polish on approximately 8-10 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
  • SATISFACTION GUARANTEED – The National Geographic STEM series provides high-quality products that are a whole lot of fun! If your experience is anything less than extraordinary, let us know so we can make it right for you

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Frequently bought together

  • NATIONAL GEOGRAPHIC Rock Tumbler Grit - 3.28 Pounds Rock Polishing Grit Media, Works with any Rock Tumbler, Rock Polisher, Stone Polisher, Polishes 8-10 Pounds of Rocks
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  • NATIONAL GEOGRAPHIC Rock Tumbler Kit-3LB Extra Large Capacity, 3LB Rough Gemstones, 4 Polishing Grits, Jewelry Fastenings, STEM Science Kit for Boys and Girls,
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  • NATIONAL GEOGRAPHIC Rock Tumbler Refill Kit - Gemstone Mix of 9 varieties including Tiger's Eye, Amethyst and Quartz - Comes with 4 grades of Grit, Jewelry Fastenings and detailed Learning Guide
Total Price: S$472.71
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Product description

The National Geographic Rock Tumbler Grit Bulk Pack contains over 3 pounds of rock polishing grit, compatible with any rock tumbler!

This Kit Includes:

- 4 Stages of Rock Polishing Grit
- 1 10 mL Grit Scoop
- Rock Tumbling Instructions


This four-stage silicon carbide grit for rock tumbling system is the ideal way to give rough rocks a smooth, polished look. The first rock polishing stage smooths rough edges and provides initial shaping. The second stage smooths the rock surfaces even more. The third stage provides a strong pre-polish, followed by the fourth stage which completes the grit polishing process.

The 10 mL scoop in the grit refill kit ensures accurate grit measurements for every stage, allowing you maximize your grit usage for up to 10 pounds of rocks!

This grit refill for rock tumbler pack is compatible with any rock tumbler on the market. But for best results, use this rock tumbler grit and polish refill with National Geographic rock tumblers and rock tumbling supplies, including ceramic media and GemFoam.

National Geographic Toys makes the highest quality hands-on science toys, and all products are backed by exceptional service.

About the National Geographic Society: With a mission to inspire people to care about the planet, the National Geographic Society is one of the world’s largest nonprofit scientific and educational organizations.


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rock, tumbler, kit, polishing, polish, gift, boys, girls, year, stem, activity, educational, science

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Most helpful customer reviews on Amazon.com

Amazon.com: 4.4 out of 5 stars 750 reviews
Abraham Lincoln Vampire Hunter
2.0 out of 5 stars Final Stage DOES NOT achieve polish
28 September 2018 - Published on Amazon.com
Verified Purchase
113 people found this helpful
Jason R
1.0 out of 5 stars The polish isn't really a polish.
25 December 2019 - Published on Amazon.com
Verified Purchase
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1.0 out of 5 stars The polish isn't really a polish.
Reviewed in the United States on 25 December 2019
I bought a National Geographic rock tumbler for my kid. The tumbler only came with enough grit for one batch, so I also bought this.

When the first batch was done, I was a little disappointed. I had a tumbler when I was a kid and I remember the rocks having a glassy finish. These did not. They looked like river rocks. So I read the directions again and saw that they recommend adding some mineral oil to give them a shine. I did and it helped a little. They had a little shine. About like a mat finish. But they were not glossy at all.

I did another batch with similar results. So then I did some research and figured out the final step was the problem. What they give you is a finer grit for stage four, but it's not really a polish. Most websites I found recommended aluminum oxide for the final stage, so I ordered some on Amazon.

I re-tumbled the previous batch with the aluminum oxide, and the difference was night and day on some of the rocks (a few were too porous to really shine up.) Then I did another batch using the first three stages of this grit, followed by aluminum oxide for the final stage. The results were the same. The rocks that could be polished looked like glass. A couple rocks again were too porous.

So if you buy this, your rocks will look about like river rocks – not glossy. I would recommend doing some research and finding a better kit. Personally, I'll use the first three stages until I run out, but use aluminum oxide for the final step.
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68 people found this helpful
ML
3.0 out of 5 stars Final Step - NOT Glossy
25 September 2019 - Published on Amazon.com
Verified Purchase
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3.0 out of 5 stars Final Step - NOT Glossy
Reviewed in the United States on 25 September 2019
You will need to purchase ceramic and/or plastic fillers to cushion the blow of the rocks. And finally, the last grit does not make the rocks glossy, merely very smooth. For your final step, you need to tumble the rocks with fillers and either micron aluminum oxide or cerium oxide to achieve that wet, glossy shine. That's about another $50, or purchase a grit kit that has one of these compounds in their assortment for their final step.
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58 people found this helpful
Victoria T.
5.0 out of 5 stars A lot of product for a good price.
11 January 2018 - Published on Amazon.com
Verified Purchase
78 people found this helpful
Brian O.
3.0 out of 5 stars Final stage is not aluminum oxide.
1 March 2019 - Published on Amazon.com
Verified Purchase
39 people found this helpful