1) Soft sponge with Nylon Velcro-Nylon hooks and Flannelette
the soft interface pad increases conformability,allowig you to follow contours 
and get in closer to most edges.
2) Use with a standard 5 inch or 6 inch backing plate (Back-Up pad)
3) Constructed of a soft durable foam with dust holes 
(can be used with clean sanding, and non dust free discs or regular discs. 
4) More type of interface pad for choose. (Non-hole, 6 dust holes, 7 dust holes, 8 dust holes，9 dust holes,15 dust holes,17 dust holes.）