These discs are coated with pressure sensitive adhesive. 100/Box and available from 80 to 800 grit.

Taipan's sanding disc have a formulated coating to reduce build up on your sanding disc.  After all you don't want to sand what you are sanding with what you are sanding.  Mamma always said " if you push too hard, you will give yourself an aneurysm". So take it easy, don't push so hard and let the disc do the work.