Made in the USA from CNC'd 6mm thick 7075 aluminium. This is the new one-piece guarded version of the Key sprocket. Made with input from Ben Lewis to protect you chain during crooks or slide nicely when in a crank arm grind. Features 4 sprocket bolt holes and new teeth design for better chain engagement and longer life. Comes with top hat washers to fit any cranks ###section### Product Specs TYPE: Bolt On MATERIAL: Alloy WEIGHT: 130g / 4.6oz Colour: Black; Size: 28t, 25t