3M Cubitron 125 mm sanding discs in a sample pack...pretty sweet. Note the "Not For Retail Sale" notice on the front of the package, now that makes sense because these things were only 30 cents each...that's what I'd call a loss leader.
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So Mother Mining offers a package of 3 each 80-120-150-180-220 film discs and a package of 5 each 240-320-400 film discs. If purchased in these 15 disc trial packages the 125 mm discs are 30 cents each, if purchased in normal 50 each quantities they are 90 cents each.
This allows you to figure out what papers you really need and will use. I also like that 3M is using a film based substrate as compared to a paper based substrate. The film based substrate goes back to 3M's experience with automotive finishing. It's supposed to provide a smoother, more uniform surface and is compatible with water.

These are the 3M part numbers for the discs...No Hole (NH) discs on the left and the Clean Sanding Discs (spiral hole pattern) on the right.

So here's the selection from 80 to 400.
