Slime Balls Hairballs 50-50 95a 56mm Wheels Slimeballs 50-50 Hairballs wheels are dyed with vivid colors on white high performance all terrain 95a urethane and feature art by FALU @falucasrolei based off the original art by Jim Phillips. Hairballs have a hard edge conical shape for firm lock in and wide riding surface for consistent speed and slide. All Slime Balls skateboard wheels are sold as sets of 4. Road Surface (Millimeters) 22 Wheel Width (Millimeters) 37