Available in 5mm and 10mm versions. The thicker the interface pad, the more it will reduce the cut of the sanding disc and increase safety (prevent burning through). Some polishing pad types (for example microfibre pads with no built-in interface layer) can also be used with a soft interface to aid conformability or lessen the cut. Please note whether the Velcro attachment type is suitable for your abrasive. Soft abrasives should only be used with micro hook-it Velcro attachment. Standard film, paper and foam discs can be used with standard hook-it Velcro.