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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Refill Grit Kit w MJR Tumblers Premium Quality Extreme Polish 12,000 Grit Sub Micron Aluminum Oxide Polish for Unparalleled Results. For 3lb Rock Tumblers w Silicon Carbide, Disabled and Veteran Owned

Refill Grit Kit w MJR Tumblers Premium Quality Extreme Polish 12,000 Grit Sub Micron Aluminum Oxide Polish for Unparalleled Results. For 3lb Rock Tumblers w Silicon Carbide, Disabled and Veteran Owned

Product ID: 77741296

Details

Brand
MJR Tumblers
Grit Material
Aluminum
Grit Type
Coarse; Fine;
Item dimensions L x W x H
8 x 6 x 0.4
Material
Aluminum Oxide

🧴Premeasured 4-stage grit kit

⚙️12,000 grit sub-micron polish

🇺🇸Veteran & Disabled owned USA brand

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VT6674

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Sold byAmazon VanuatuDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Details

Brand
MJR Tumblers
Grit Material
Aluminum
Grit Type
Coarse; Fine;

Description

✨ Polish Like a Pro, Rock the Results! ⚙️

COMPLETE GRIT SPECTRUM - Includes coarse, fine, pre-polish, and extreme polish for professional-grade rock tumbling results.
EXPERT GUIDANCE INCLUDED - Detailed, heartfelt instructions with tips and tricks to elevate your tumbling game every time.
EFFORTLESS 4 STAGE SYSTEM - Premeasured grits for seamless use in all rotary and vibratory tumblers—just pour and tumble.
UNMATCHED POLISH PRECISION - Experience the finest 12,000 grit aluminum oxide polish for mirror-like rock finishes.
CRAFTED WITH CARE INTEGRITY - Proudly disabled and veteran owned, supporting American craftsmanship from Pecatonica, Illinois.

MJR Tumblers' Refill Grit Kit delivers a premium 4-stage rock tumbling experience featuring exclusive 12,000 grit sub-micron aluminum oxide polish. Designed for 3lb rotary and vibratory tumblers, this premeasured kit ensures flawless, mirror-quality finishes. Veteran and disabled owned, this American-made kit combines quality materials with expert instructions to guarantee unparalleled polishing results.

Specifications

ASIN	B07DZ54NQN
Best Sellers Rank	#13,878 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #9 in Tumbling Media
Brand	MJR Tumblers
Brand Name	MJR Tumblers
Compatible Material	Aluminum Oxide; Silicon Carbide
Customer Reviews	4.5 out of 5 stars 1,250 Reviews
Grit Material	Aluminum Oxide; Silicon Carbide
Grit Material Type	Aluminum Oxide; Silicon Carbide
Grit Number	12000
Grit Type	Coarse; Fine; Pre Polish; Polish
Item Dimensions	8 x 6 x 0.4 inches
Item Weight	0.56 Pounds
Item dimensions L x W x H	8 x 6 x 0.4 inches
Manufacturer	MJR Tumblers
Material	Aluminum Oxide, Plastic Pellets, Silicon Carbide
Material Type	Aluminum Oxide, Plastic Pellets, Silicon Carbide
Model	MJR3pgk
Number of Items	4
Part Number	MJR3pgk
Set Name	4-Stage Rock Tumbler Grit Kit
Unit Count	4.0 Count

Reviews

L**E

26.03.2026

J**E

15.12.2025

J**R

20.03.2026

K**R

6.02.2026

K**A

11.07.2025

T**I

19.11.2025

B**S

24.02.2026

B**N

4.10.2025

K**E

30.01.2025

T**N

29.03.2026

S**O

20.03.2026

A**Y

27.08.2024

L**E

3.03.2025

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