Go Project Bow and Arrow Inline Skate Wheels 100mm (4 pack)The Go Project 100mm wheels use our now renowned urethane formula combined with an innovative 'Bow and Arrow' core. As the skater pushes the core bows a little, storing energy (like pulling back a bow). On completion of the stride the stored energy is released (like an arrow), giving the skater a boost. Bullseye. We sell the 100mm wheels in both sets of 4 and sets of 6 (for four wheeled or three wheeled skates). At Go Project we understand the