Size: 7 inches / 180mm Suits for all kinds of sponge, wool, microfiber and sanding pads with 5" (180mm) backing. Edge Angle: 29° With unique tapered 29-degree edge, offers excellent edge flexibility Rubber Cap Protect metal thread shank of the backing pad. Remember to take it off before installing. Rubber Ring Between backing pad and machines. You can choose to remove it or leave it there. Made of heat-resistant material and use a J-Hook design, these make the backing pads become stronger and with more stickness. The hook & loop backing will last longer in heavy using applications. Made of high quality polyurethane material, used for variety of applications tailored to be either rigid or flexible but never stiff. Works excellent with hoop & loop sandpaper discs, as well as hook & loop buffing and polishing pads. Allows for quick and effective sanding. Its durable, flexible, and tapered edge makes it easier to snad on flat or contoured surfaces at low or high speeds. Soft density interface pads hook and loop sponge cushion buffer backing pad, one side is hook face, can stick with sanding discs, another side is loop face, can stick with sanding pads. Constructed of soft durable sponge which allows the technician to follow contours and get closer to edges while minimizing burn through, reduce vibration from orbital sanding tool for improved results.