Labeda EVO Spacer System is an external aluminum 2 piece spacing system (male & female part), that is required to be used with the Labeda Whips or Labeda Tinder goalie Wheel. This is for the wheels to be mounted in your current skate frames correctly. These EVO Spacers are made to fit 6mm Axles ONLY, like on modern Bauer/Mission skates. Available: Full Kit for 8 wheels (8 male & 8 female part total of 16 pieces) Half Kit for 4 wheels (4 male & 4 female part total of 8 pieces) Sorry - no discounts apply to EVO Spacers. Shop Notes: -Whip Wheels / these Evo Spacers are made for use with frames that use 6mm axles. -Not covered by warranty for use on concrete surfaces -There is a new very custom 8mm Evo Spacer kit here for use on 8mm axles like Rinkster Sniper Frames