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National Geographic Rock Tumbler Grit and Rock Polishing Refill Kit

  • Based on 927 reviews
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Availability: Only 5 left in stock, order soon!
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Arrives Thursday, Sep 17
Order within 7 hours and 32 minutes
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Style: Complete Starter Kit


Features

  • QUALITY GRIT RESULTS IN A DAZZLING POLISH - The rock polishing grit in this pack is high-quality silicon carbide and will polish 8-10 lbs of rocks, includes measuring scoop and storage containers with secure screw-top closures for easy storage.
  • 3 POUNDS OF ROCKS FROM MADAGASCAR - Keep your rock tumbler going with 3 pounds of rocks from Madagascar. This rock refill pack can include rose quartz, jasper, and other rock and gemstone varieties.
  • IMPROVE YOUR ROCK TUMBLING RESULTS - Ceramic tumbler media makes the entire rock tumbling process more effective, improving delivery of rock tumbling grit, quieting tumbler noise, reducing rock breakage, and acting as a filler for smaller batches.
  • AN INNOVATIVE WAY TO MAKE TUMBLED ROCKS SHINE - GemFoam is a unique new rock polisher media that gives unprecedented shine to tumbled rocks. Just add the patent-pending rock polishing media to your tumbler after the final grit cycle for great results!
  • 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!

Description

Get started tumbling the right way with the Mega Rock Polisher Media Kit! Includes 3 pounds of rough rocks, 4 stages of silicon carbide polishing grit, 1.5 pounds of ceramic media, 30 grams of GemFoam, 10 mL grit scoop, jewelry fastenings, and Learning Guide with instructions. The National Geographic Mega Rock Media kit is a great way to keep the fun rolling, providing everything you need from rough rocks to polishing media and more! This kit includes a 3 pound Madagascar rock refill mix, 4 stages of silicon carbide polishing grit compound, 1.5 pounds of ceramic media, 30 g GemFoam, 10 mL grit scoop, jewelry fastenings, and Learning Guide with instructions. Our 4-stage bulk rock tumbling grit is high-quality silicon carbide, perfect for polishing the 3 pounds of Madagascar rocks in the kit. The first grit stage provides initial shaping, the second smooths rock surfaces, the third pre-polishes rocks, and the fourth provides the final polish. We include a 10 mL grit scoop so you can get precise measurements for every stage. Grit comes packaged in secure, screw-top containers for easy storage. Add our ceramic tumbling pellets to the mix and you'll see even better results! Ceramic media helps distribute grit to rock surfaces during tumbling, reduces tumbler noise, serves as filler for smaller batches, and reduces rock breakage through every grit cycle. One of the most exciting elements of this tumbling accessories pack is our new patent-pending GemFoam. This tumbling media was designed to add dazzling shine to polished stones. Simply tumble polished rocks with GemFoam for a high-quality shine. Instructions inside the kit detail how to use all the tumbling media for optimal results. Pick your favorites and use the jewelry fastenings to create gifts for friends or family! This pack is compatible with all tumblers, but for best results use with National Geographic tumblers and tumbling accessories. Order today! We make the highest quality hands-on science toys, and all products are backed by exceptional service. 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. Your purchase has purpose! Every purchase helps support the global nonprofit National Geographic Society in its work to protect and illuminate our world through exploration, research, and education.

Brand Name: Blue Marble


Age Range Description: 8 years and up


Sub Brand: National Geographic


Manufacturer Warranty Description: We're proud to make the highest quality products which are backed by exceptional service.


Manufacturer Maximum Age (MONTHS): 1188


Manufacturer Minimum Age (MONTHS): 96


Global Trade Identification Number: 05


Set Name: Complete Rock Polisher Tumbler Media Kit (7 Items)


Manufacturer: JMW Sales, Inc.


UPC: 816448027505


Unit Count: 1 Count


Included Components: 1.5 pounds of Ceramic Media, 10 mL Grit Scoop, 3 Pound Madagascar Rock Refill Mix, 30 g GemFoam, 4 Stages of Silicon Carbide Polishing Grit Compound, Detailed Learning Guide with Instructions, Jewelry Fastenings


Item Type Name: Complete Rock Polisher Tumbler Media Kit


Model Number: NGFOMCERGRTMD


Manufacturer Part Number: NGFOMCERGRTMD


Educational Objective: STEM


Supported Battery Types: No batteries required


Operation Mode: Manual


Indoor Outdoor Usage: Indoor


Theme: Rock Tumbling


Color: Multicolor


Size: One Size


Item Weight: 3 pounds


Item Dimensions: 9.84 x 7.09 x 5.51 inches


Material Type: Rocks, Silicon Carbide, Ceramic, GemFoam, Metal


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Thursday, Sep 17

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

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Top Amazon Reviews


  • Great for price
Style: Complete Starter Kit
I keep mine in my garage, so I honestly don't know how loud it would be keeping it in the house... But what I can say is, this rock tumbler is so great! It has settings and timers so I can make great smallish sets of my rocks I always go hunting for. I will say, do your research on what rocks to put together and what grit to start with them because not all rocks/crystals are as dense as some. So if you do that and order more grit/filler, you got yourself a damn good tumbler for (to me) Small to medium loads of stocks and crystals 💖 ... show more
Reviewed in the United States on May 6, 2024 by Holly MM

  • Nice kit
Style: Complete Starter Kit
If you need additional media for polishing stones, this works well, has good instructions, and a good variety of various grit to ensure a nice looking finish. Cleans up easy, just make sure you don't do it in you sink, go outside!
Reviewed in the United States on February 1, 2024 by Doughboy

  • Useful items, reasonably priced
Style: Complete Starter Kit
Good kit if you’re into rock tumbling.
Reviewed in the United States on October 30, 2025 by Colorado Dad

  • Good quality
Style: Complete Starter Kit
Comes with a good amount of stones to tumble , has enough grit do several batches, I wish that Fort was more of a polishing material versus a finer grit.
Reviewed in the United States on May 4, 2023 by christina

  • Good instructions
Style: Complete Starter Kit
Seems to work well..
Reviewed in the United States on July 5, 2024 by whitegurl

  • Everything you need to get started in rock polishing!
Style: Complete Starter Kit
My daughter has been collecting rocks for years (she’s 9) and was always wondering why she could never find rocks like at the gift shops. She got the NatGeoToys tumbler kit for Christmas and we ordered the refill kit right after to get the finished quality! The beads and foam polish cubes add the finishing touches to an incredible result! Add an additional aluminum oxide cycle for glass-like finish. ... show more
Reviewed in the United States on February 14, 2021 by Matthew Knoll

  • Everything you need
Style: Complete Starter Kit
Honestly everything you need to polish your stones and crystals.
Reviewed in the United States on August 14, 2024 by Rebecca

  • Polished to Perfection
Style: Complete Starter Kit
I love this small, but super effective rock polisher, this is a beginner set, so you need to purchase the larger set of polishing grit. Takes me back to watching my grandpa polishing all of our treasured finds on the beach. I love the sound of the tumbler. The sessions are days apart, not instant, so be ready to plan your time wisely. ... show more
Reviewed in the United States on August 31, 2020 by Shannon Salsa

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