This is a very random example:

http://www.lumberliquidators.com/ll/c/Heavy-Duty-Felt-Pads-Pack-Value-Bag-Norge-F9852/10024949?Wt.ps_id=PS_google_1023&CAWELAID=1925959749&catargetid=1823037836&cadevice=c&cagpspn=pla&gclid=CLmX-brvuLwCFY1AMgodVD8Ajg

They come in different colors and thickness. But the question is, are they soft or will they scratch disk media badly? I have no clue. But if they are made from similar material I would think a small hole punch would work well to make many from one pad. Thickness is not entirely critical.

But really just a guess as to how well these would work.