JohnP, you can get a larger variety in 20 per pack of each grit or you can buy a sample kit for $16.95, which I think is a little high, but I bought them anyhow. Go to
www.aircraft-tool.com, click on "download ecatalog", then in catalog, click on "3M products," then scroll about half way down the page and you will find them. Let me know if you don't find them. I have an extra sample kit that I might considering selling for the $16.95 they cost me plus shipping if you can't find them. The sample kit consists of:
7440 -- 50 grit - heavy duty pad - Tan/Brown
7446 - 150 grit - blending pad - Gray
7447 - 400 grit - general purpose pad - Maroon
8447 - 600 grit - production pad - Maroon (different shade of maroon than 7447)
6448 - 800 grit - light duty - Dark Gray
7448 - 1000 grit- ultra fine - Light gray
7445 - 1200 grit- light duty - White
Some of the higher grit pads when rubbed with your fingers, feel coarser then the lower grit pads, but the numbers I have listed is what came off the box they are shipped in.
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In the old days, they used axes to chop up wood...Nowadays, they use Buzzsaws.