ITEM NAME:2pack High Density Cushion Interface Pads Sanding Backing Pads 3'' .like-pro-float .like-pro-price-both{clear: both;.The interface pad is placed between the backing pad of the sander and the sanding disc. Using the interface pad will also produce a softer result and will minimise flat spot sanding. 2 Pieces Soft Density Interface Pad.