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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✨ Polish Like a Pro, Shine Like No Other! 🪨

BONUS EXPERT GUIDANCE - Includes free, easy-to-follow instructions packed with pro tips to elevate your rock tumbling game.
VERSATILE COMPATIBILITY - Perfectly designed for all 3 lb rotary and vibratory rock tumblers, ensuring flawless results every time.
EFFORTLESS 4 STAGE SYSTEM - Premeasured silicon carbide grits for coarse, fine, pre-polish, and polish—just pour and tumble, no guesswork needed.
UNMATCHED 12 000 GRIT POLISH - Experience the ultimate shine with our exclusive sub-micron aluminum oxide polish that outperforms all others.
VETERAN DISABLED OWNED EXCELLENCE - Support a proud American company committed to quality and community from Pecatonica, Illinois.

The MJR Tumblers Refill Grit Kit delivers a premium 4-stage silicon carbide and aluminum oxide polishing system with an exclusive 12,000 grit extreme polish. Designed for 3 lb rock tumblers, this USA-made, veteran-owned kit offers premeasured grits for effortless use and superior results, complete with expert instructions to perfect your craft.

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€ 65.09

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Material	Aluminum Oxide Silicon Carbide Plastic Pellets
Grit Material	Aluminum Oxide,Silicon Carbide
Item dimensions L x W x H	20.3 x 15.2 x 1 Centimeters
Brand	MJR Tumblers
Grit Type	Medium
Item Weight	254 g
Grit Number	12000
Number of Items	4
Manufacturer	MJR Tumblers
Model Number	MJR3pgk
Batteries Required	No
Batteries Included	No
Material Type(s)	Aluminum Oxide Silicon Carbide Plastic Pellets
Colour	Green
Product Dimensions	20.32 x 15.24 x 1.02 cm; 254.01 g
Item model number	MJR3pgk
Manufacturer recommended age	8 months and up

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

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