HiLo set includes 4 76mm and 4 80mm Wheels, 16 Hybid Ceramic Bearings, 8 8mm Spacers, and 8 6mm Stepped Spacers (You only need 1 set of spacers depending on your skates, we inclue both as a courtesy). Labeda Addiction Wheels offer a new concept in wheel making. The Addiction wheel is an indoor wheel designed for tile surfaces (ie Sport Court), but it has an outer urethane hardness between 83-86A! That's right, an indoor wheel with an outer hardness harder than most outdoor wheels. So you know the durability and the speed is going to be incredible with these wheels and they should be at this price. Amp Hybrid Ceramic bearings are like stimulants for your wheels. With this bearing you get the precision of ceramic and the durability of steel balls. The single Ceramic ball cleans debris and cools friction allowing for a longer lasting bearing. HiLo set includes 4 76mm and 4 80mm Wheels, 16 Hybid Ceramic Bearings, 8 8mm Spacers, and 8 6mm Stepped Spacers (You only need 1 set of spacers depending on your skates, we inclue both as a courtesy). Labeda Addiction Wheels offer a new concept in wheel making. The Addiction wheel is an indoor wheel designed for tile surfaces (ie Sport Court), but it has an outer urethane hardness between 83-86A! That's right, an indoor wheel with an outer hardness harder than most outdoor wheels. So you know the durability and the speed is going to be incredible with these wheels and they should be at this price. Amp Hybrid Ceramic bearings are like stimulants for your wheels. With this bearing you get the precision of ceramic and the durability of steel balls. The single Ceramic ball cleans debris and cools friction allowing for a longer lasting bearing.