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

Product ID: 523505468

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Details

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

📏Compact 20.32 x 15.24 x 1.02 cm

🔧1.5 oz Aluminum Oxide Polish

⚙️3 oz Silicon Carbide Grit

Description

✨ Unleash Your Inner Geologist with MJR Tumblers!

POLISH LIKE A PRO - Achieve a mirror-like finish with our 1200 Aluminum Oxide polish.
AGE APPROPRIATE FUN - Recommended for ages 8 months and up, perfect for budding rock hounds.
NO BATTERIES NEEDED - Eco-friendly and hassle-free, just add your rocks and grit!
LIGHTWEIGHT PORTABLE - Weighing only 254.01 g, it's easy to store and transport.
STEP BY STEP PERFECTION - Includes 3 grades of Silicon Carbide Grit for optimal tumbling results.

The MJR Tumblers Refill Grit Kit is designed for 3 LB rock tumblers, featuring a comprehensive set of grits and polish to ensure your rocks shine like never before. With a total of 3 ounces of graded Silicon Carbide Grit and 1.5 ounces of Aluminum Oxide Polish, this kit is perfect for both beginners and seasoned enthusiasts. Lightweight and easy to use, it’s the ideal companion for anyone looking to elevate their rock tumbling game.

Specifications

Product Dimensions	20.32 x 15.24 x 1.02 cm; 254.01 g
Manufacturer recommended age	8 months and up
Item model number	MJR3pgk
Batteries Required?	No
Batteries included?	No
Material Type(s)	Aluminum Oxide Silicon Carbide Plastic Pellets
Colour	Green
ASIN	B07DZ54NQN

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