The Stolen Throttle Loose Ball Auminum 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 very durable and dependable alloy. 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. With large platforms like these, it also becomes easier to catch the pedals after doing tricks that require your feet to leave the pedals.