Number of Wheels - This set of wheels comes in your choice of a 4-Pack for mixing and matching durometers or an 8-Pack for one pair of skates! * Size - 63mm x 35mm * Stalker 88a - uncoated concrete/cement, uncoated/dusty wood floors or old sport tile. - Creeper 90a - coated concrete/cement, wood floors, masonite, old sport tile. - Chaser 92a - coated concrete/cement, freshly coated wood floors, masonite, new sport tile, banked tracks. * Breaker 94a - coated concrete/cement, freshly coated wood floors, masonite, new sport tile, banked tracks. - Vanish 96a - freshly coated wood floors, new sport tile, banked tracks. * Bearings sold separately