The Total BMX Rotary Sprocket features a unique modern spoke and concave design. Built from CNC machined, high-quality 7075-T6 aluminium formaximum strength, durability and rigidity all while keeping the sprocket incredibly lightweight. The Rotary Sprocket can fit 19mm, 22mm and 24mm crank spindles with the adapter rings included. ###section### Product Specs TYPE: Bolt On MATERIAL: Alloy WEIGHT: 59g (2.08oz) Colour: Black, Polished, Rainbow; Size: 28t, 25t