Odyssey's Utility Pro Sprocket has a classic and clean looking design that's both strong and lightweight. It's built from 8mm thick CNC machined 7075 aluminium that's why it's such a durable sprocket. The Utility Pro is compatible with all BMX chains and includes 19mm and 22mm adapters. ###section### Product Specs TYPE: Bolt on MATERIAL: Aluminium WEIGHT: 190g (6.72oz) Colour: Black; Size: 30T