Can you use this for a 1 lb National Geographic tumbler

It should work just fine. This is just the grit and the grit is usable in any tumbler.

After the polish, are the rocks glossy and shiny?

They won't be as shiny as you think. The grit polish the rocks so try are smooth but there is a fifth stage in rock polishing called burnishing that you have to do at the end. Search the internet on directions but it involves tumbling them in soap like borax. Also, if you want your rocks to look good you have to get the ceramic filler pellets to even out the tumbles. Plastic doesn't do the trick like ceramic. Filler pellets vs no filler pellets is a big difference on helping the rocks get shiny.

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MJR Tumblers Refill Grit Kit for 3 LB Rock Tumblers Silicon Carbide Aluminum Oxide Media Polish

MJR Tumblers Refill Grit Kit for 3 LB Rock Tumblers Silicon Carbide Aluminum Oxide Media Polish

Product ID: 407853171

Details

Material
Aluminum Oxide
Grit Material
Aluminum Oxide
Item dimensions L x W x H
20.3 x 15.2 x
Brand
MJR Tumblers
Grit Type
Medium

🔬12,000 grit sub-micron polish

⚙️4-step precision grit system

🇺🇸Proudly USA made & veteran owned

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VT11462

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In stock

Sold byAmazon VanuatuDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

✨ Elevate Your Rock Tumbling Game with Precision Polish Power! ⚙️

SEAMLESS COMPATIBILITY - Perfectly engineered for 3 lb tumblers using silicon carbide and aluminum oxide media.
COMPACT EFFICIENT REFILL KIT - Optimized quantities designed specifically for 3 lb rock tumblers to maximize performance.
VETERAN OWNED QUALITY ASSURANCE - Support a disabled veteran-owned brand with trusted American craftsmanship.
PRECISION MULTI STAGE GRIT SYSTEM - Four distinct grit grades (60/90, 120/220, 500/600, 12000) for flawless rock tumbling.
ULTRA FINE POLISH FOR MIRROR FINISH - 12,000 grit aluminum oxide polish delivers unparalleled shine and smoothness.

The MJR Tumblers Refill Grit Kit offers a professional-grade 4-step silicon carbide and aluminum oxide polishing system tailored for 3 lb rock tumblers. Featuring a premium 12,000 grit sub-micron polish, this USA-made, veteran-owned product ensures superior shine and smoothness for hobbyists and pros alike.

Specifications

ASIN	B07DZ54NQN
Best Sellers Rank	#350,791 in Health & Personal Care ( See Top 100 in Health & Personal Care ) #994 in Household Cleaning Metal Polish
Brand	MJR Tumblers
Brand Name	MJR Tumblers
Compatible Material	Aluminum Oxide; Silicon Carbide
Country of Origin	USA
Customer Reviews	4.3 out of 5 stars 460 Reviews
Grit Material	Aluminum Oxide,Silicon Carbide
Grit Material Type	Aluminum Oxide,Silicon Carbide
Grit Number	12000
Grit Type	Medium
Item Dimensions	20.3 x 15.2 x 1 Centimeters
Item Type Name	MJR Tumblers Refill Grit Kit for 3 LB Rock Tumblers Silicon Carbide Aluminum Oxide Media Polish
Item Weight	0.56 Pounds
Item dimensions L x W x H	20.3 x 15.2 x 1 Centimeters
Manufacturer	MJR Tumblers
Material	Aluminum Oxide Silicon Carbide Plastic Pellets
Material Type	Aluminum Oxide Silicon Carbide Plastic Pellets
Model Number	MJR3pgk
Number of Items	4
Part Number	MJR3pgk
Unit Count	4.0 Count

Reviews

T**N

29.03.2026

S**D

3.01.2026

J**F

16.02.2026

B**P

31.03.2026

K**A

11.07.2025

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