Size: 8 x 13 cm to fit Pep Mate 3 - comes in 3 grades: 80x 120, and 240
You can purchase a single sheet, or in a 10 or 20 pack.
You can use this sanding mesh directly with the sander or attach the 10mm thick Foam Interface Pad for sanding of a curved or detailed surface. 
Mesh is far superior to sandpaper - it will last longer and keep down dust.
Reusable: just vacuum, tap clean or wash off.  Dry.  And it is ready again.