5" Grip Faced Backup Pad with "Palm" Hook Mirka DA back-up pads are a top quality molded polymer construction. These backup pads work great with the Dynabrade Random Orbital Sanders. Hook face (Velcro or Hook and Loop) for use with Mirka Grip backed sanding discs. The Mirka backing pads for sanding machines are designed to meet the challenges set when performing demanding sanding operations. Mirka has developed backing pads for both sanding with traditional abrasives and for sanding dust-free with Mirka's Net Sanding dust extraction system. In order to achieve the best performance and a good sanding result, it is important to combine the right sander with the right accessories. Browse our backing pads and find the backing pads suitable for your sanders.