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: 318896364

Details

Brand
MJR Tumblers
Grit material
Aluminum Oxide
Grit type
Coarse
Item dimensions L x W x H
20.3 x 15.2 x
Material
Aluminum Oxide

✨Aluminum Oxide polish for mirror finish

🪨Silicon Carbide for superior abrasion

⚙️4-step precision grit system

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Description

🪨 Polish Like a Pro — Because Your Rocks Deserve the Spotlight

CRAFT YOUR MASTERPIECE - Transform raw stones into gallery-worthy gems with professional-grade media
4 STAGE GRIT REFINEMENT - Stepwise silicon carbide grades ensure flawless rock tumbling
PREMIUM POLISHING POWER - 1200-grade aluminum oxide delivers a brilliant shine
COMPACT CONVENIENT KIT - All essential grits and polish in one sleek, easy-to-store package
OPTIMIZED FOR 3 LB TUMBLERS - Perfectly portioned for your 3-pound rock tumbler workload

The MJR Tumblers Refill Grit Kit is a specialized 4-step media set designed for 3-pound rock tumblers, featuring graded silicon carbide grits (60/90, 120/220, 500/600) and a 1200 aluminum oxide polish. This kit enables precise abrasion and polishing stages to transform rough stones into smooth, lustrous gems, ideal for hobbyists and professionals seeking consistent, high-quality results.

Specifications

ASIN	B07DZ54NQN
Brand Name	MJR Tumblers
Compatible Material	Stone
Customer Reviews	4.4 4.4 out of 5 stars (987)
Grit Material Type	Aluminum Oxide
Grit Number	12000
Grit Type	Coarse
Item Dimensions	20.3 x 15.2 x 1 centimeters
Item Weight	254 g
Manufacturer	MJR Tumblers
Material Type	Aluminum Oxide Silicon Carbide Plastic Pellets
Model	MJR3pgk
Number of Items	4
Part Number	MJR3pgk
Set Name	Where

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