STF Retros V1 Standard White 103A 54mm Skateboard Wheels SNH 006 It is made of 100% It is made of 100% cotton and has a tapered cut thanks to the hardshell construction it protects your head from falls The STF formula has high rebound for high speed and slide capabilities while being extremely resistant to flat spots The Bones Wheels brand was founded in 1977 as a division of Powell Peralta