roll fast, grip when you need to and slide when you want to, without flat spotting. STF gives you more control to skate with confidence. Bones STF wheels outperform all other wheels, and because they wear so well, they last several times longer than normal wheels, making STF wheels the best for less. Bones STF wheels are available in the original 103A and the new 99A Easy Streets™ for greater roll, control and softer landings on rougher terrain. Wheel Diameter 52mm Wheel Width 31mm Wheel Hardness 99a Wheel Formula STF Wheel Color White Wheel Suggested Use Street Wheel Surface Smooth Wheel Shape V1 Bones Retros V1 Standard 99A STF Skateboard Wheels White 52mm