Youth Hilo Set Includes 4 68mm, 4 72mm 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 Labeda Gripper Hockey Wheels have stood the test of time due to their quality construction process and design. The Gripper wheels were the first hockey wheels to bring the Flex Technology to inline hockey with it's smaller core design that allows the urethane to flex, therefore maximizing grip and speed. Best of all Labeda is a family owned business and makes all of their wheels, including these Grippers, right here in the USA. 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.