Featuresdiameter 76mmwidth 57mmcontact patch 57mmcore largesold as a pack of 4 bearings sold separatelymaterialsdurometer 78a polyurethaneput on a show for the crowd with the gyro longboard wheels from forward designed especially for speed with their large core and bigger diameter these retro rollers also feature a special urethane formula that39s sure to have you gripping on to the edge of your seat pick up a set today and make sure that all eyes are on you until the credits roll