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.

ASIN	B07DZ54NQN
Best Sellers Rank	#319,363 in Health & Personal Care ( See Top 100 in Health & Personal Care ) #898 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 435 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
Unit Count	4.0 Count

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

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