TheHI-LO Aluminum Roller Hockey Chassisis highly regarded amongst pro roller hockey players worldwide and is one ofthe most popular wheel set-ups.The HI-LO aluminum frame is designed to hold (2) 80mm wheels in the rear with (2) 76mm wheels in the front and now has an even sleeker look than before. Attack angle becomes much more aggressive for increased maneuverability, power, and balance. The aluminum chassis kit comes with 2 chassis (8) 6mm axles, 8 long sleeved 608 bearing spacers, and 1 axle tool.