Description Interface pads are placed between the backing plate and the sanding disc to increase disc flexibility and assist in the even distribution of machine movements and applied pressure. They increase comfort when sanding by buffering abrupt machine movements through their cushioning action. – Interface Cushion pad with extra-soft foam layer. Soft Interface Disc Pad provides extra cushion for coated and non-woven abrasive discs to prevent gouging and marring. – Soft density foam responds to contours and edges.