This pack carries (a)-(c). Remind: wet polisher is random color: Red or Blue. 3 Extra pairs of Carbon brush included. Carbon brush is consumable parts of all types of polisher. They need to be replaced when they are exhausted. Otherwise, polisher stop working. Remind: This polisher has no GFCI circuit breaker, our advice is plug this into a GFCI normally located in bathrooms and kitchens and using a extension cord from there. (b) 36 Pieces of 4 / 4 Inch / 100mm Diamond Polishing Pad for granite marble concrete travertine. 8 X Grit 50 100. 7 X Grit 200 400. 2 X Grit 800 1500. 1 X Grit 3000 6000. And 1 X 4 Rubber backer/Pad Holder.