The Primo Omniguard Sprocket was designed as a solid sprocket and guard combo to offer maximum strength and durability through ledge tricks. Made from 6061-T6 alloy that's fully CNC machined with a full wrap around nylon/fibreglass replaceable guard. The guard adds plenty of extra protection to your sprocket and chain whenever you're grinding and sliding ledges and will take a substantial amount of abuse before it needs to be replaced. With the supplied adapters the Omniguard Sprocket can be run on 19mm, 22mm and 24mm cranks. ###section### Product Specs TYPE: Bolt-On MATERIAL: Alloy WEIGHT: 82.2g (2.9oz)