How many oz is in each container?

1 Coarse-16oz. 2 Medium-13oz. 3 Pre-polish-12oz. 4 Polish-11.5 oz.

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?

I would go through Amazon to get an answer for your problem.

Can it be used together ?

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.

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?

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.

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National Geographic Rock Tumbler Grit and Media Refill with 1.36 kg Rocks

Product ID: 319966455

Details

Brand
Blue Marble
Colour
Multicolor
Special feature
GemFoam
Style
Complete Kit
Theme
Gemstone Media

🧱680 g ceramic media for noise reduction & breakage control

🪨1.36 kg authentic Madagascar rocks

⚙️4-stage silicon carbide grit polishing system

90308CFA

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Description

✨ Transform Rough Rocks into Radiant Treasures 🪨

CERAMIC MEDIA MAGIC - Enhance your tumbling efficiency—reduce noise, minimize rock breakage, and optimize grit distribution for flawless results.
REVOLUTIONARY GEM FOAM POLISH - Add the patent-pending GemFoam for an unprecedented, dazzling shine that sets your polished stones apart.
PRECISION 4 STAGE POLISHING GRIT - Master the art of rock tumbling with silicon carbide grit that shapes, smooths, pre-polishes, and delivers a mirror finish.
PREMIUM MADAGASCAR ROCK ASSORTMENT - Experience the thrill of polishing 1.36 kg of genuine rose quartz, jasper, and more—rocks you’ll proudly showcase.
COMPLETE KIT WITH JEWELRY ACCESSORIES - Turn your polished gems into stylish gifts or personal keepsakes with included fastenings and a detailed learning guide.

The National Geographic Rock Tumbler Refill Kit offers 1.36 kg of authentic Madagascar rocks combined with a comprehensive 4-stage silicon carbide grit system, 680 g of ceramic media to improve tumbling efficiency, and the innovative GemFoam polishing media for superior shine. Designed for enthusiasts aged 8 and up, this all-in-one kit includes jewelry fastenings and a learning guide, making it perfect for both educational and creative pursuits. Compatible with all tumblers, it’s a premium refill pack that elevates your rock tumbling experience with quality materials and expert-backed instructions.

Specifications

ASIN	B08B7JBVG9
Age Range Description	8 years and up
Best Sellers Rank	90,149 in Toys & Games ( See Top 100 in Toys & Games ) 737 in Educational Science Kits
Brand Name	Blue Marble
Colour	Multicolor
Country Of Origin	China
Customer Reviews	4.6 4.6 out of 5 stars (896)
Educational Objective	Develops fine motor skills, patience and following instructions
Global Trade Identification Number	00816448027505
Included Components	1.36 kg Madagascar Rocks, Ceramic Media, Patented Polishing GemFoam, Rock Tumbler Grit and Polish Refill
Is Assembly Required	No
Item Dimensions	25 x 18 x 14 centimetres
Item Type Name	Complete Rock Tumbler Refill Kit
Item Weight	3 Pounds
Manufacturer	JMW Sales, Inc.
Manufacturer Part Number	NGFOMCERGRTMD
Manufacturer Warranty Description	We're proud to make the highest quality products which are backed by exceptional service.
Manufacturer recommended age	8 - 12 years
Material Type	Ceramic
Model Number	NGFOMCERGRTMD
Number of Packs	1
Number of Players	1
Operation Mode	Manual
Power Source	Manual
Set Name	Polishing Kit
Supported Battery Types	No batteries required
Theme	Gemstone Tumbling Media
UPC	816448027505
Unit Count	1.0 count

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90308CFA

Duties & taxes included

In stock

Sold byAmazon SenegalDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Senegal.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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