The Fit Key Sprocket has a clean and classic design that features an updated tooth profile giving better chain engagement and longer tooth life. It's made in the USA from CNC machined 7075 aluminium for maximum strength and durability with a unique cutout pattern to help drop some weight. The Fly Key Sprocket can be run on 19mm, 22mm and 24mm sprockets with the supplied adapters. ###section### Product Specs TYPE: Bolt On MATERIAL: Alloy WEIGHT: 65.2g (2.3oz) Colour: Black, Polished, Clear, Blood Red; Size: 25t, 28t