This pack carries (a)-(c). We have attached 3 extra pairs of carbon brush in this package. Carbon brush is consumable parts of all types of polisher or grinder. They need to be replaced when they are exhausted, otherwise polisher stop working. (b) 9 Pieces of 4 Diamond Polishing Pad for granite marble concrete travertine. 1 X Grit 30 50 100 200 400 800 1500 3000 10000. And 1 X 4 aluminum backer/Pad Holder. And 1 Piece of 4 (velcro Backed) diamond grinding cup wheel for stone concrete surface coarse grinding smoothing. (c) 5 Pieces of 5 Diamond Polishing Pad for granite marble concrete travertine. 1 X Grit 50 100 200 400 800. And 1 X 5 aluminum backer/Pad Holder.