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). The wheel by which all other wheels are judged, the original dual durometer. We combine our specially formulated highest rebound urethane around our flex-tech core for max grip and then surround that core with our exclusive specially formulated rebound urethane to create the worlds best selling hockey wheel. 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). The wheel by which all other wheels are judged, the original dual durometer. We combine our specially formulated highest rebound urethane around our flex-tech core for max grip and then surround that core with our exclusive specially formulated rebound urethane to create the worlds best selling hockey wheel. 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.