This listing is for a complete set of Colorful Roller skate wheels and bearings. Whether you're a derby skater looking for some road work, a beach skater on the boardwalk or someone just looking for some great outdoor recreation, Atom's Pulse is your wheel! 65MM x 37MM 78A Bionic Abec-7 bearings from Atom are lubricated with speed oil and require no break-in period. Delrin cage reinforced.