Formula Four Performance Urethane lasts longer, withstands more abuse and performs superior to all other wheels. Designed to combine all the desired properties of a performance wheel without sacrificing any one attribute at the expense of another.Manufactured using a 100% pure urethane compound, with higher rebound for faster speeds over rough and smooth surfaces with a hard durometer for a smoother, faster ride that won't mush out over time. Designed with an exclusive anti-stick compound that gives a fast/consistent, smooth slide all the way through.Tablets Shape. Straight cut profile, thin riding surface, speed and control for the sick. These wheels measure 48mm x 26mm with a 99A Durometer.Wheels come in a set of 4 and include a Spitfire Sticker in the shrink wrap. SPITFIRE FORMULA FOUR 99D LIL SMOKIES TABLET SKATEBOARD WHEELS 48mm