The Alienation Effects are freestyle BMX pedals with an axle diameter of 9/16", making them compatible with two-piece and three-piece cranksets. They are made from a combination of nylon and fiberglass, which makes the pedals light, strong and capable of sliding like butter when you involve them in your grinds. For strength and durability, the spindle is made of chromoly steel, that will not be destroyed easily. Loose ball bearings for those who do not ride mud and dirt. Additionally, the dual concave shape of the platform will help locking your feet in for enhanced control.