The S&M X-Man Sprocket is built for taking abuse thanks to it's ridiculously strong construction. Made in the USA from CNC machined 6061-T6 aluminium the X-Man Guard Sprocket is super tough and incredibly durable. The S&M X-Man Guard Sprocket is compatible with 19mm, 22mm and 24mm crank spindles. ###section### Product Specs TYPE: Bolt On MATERIAL: Alloy WEIGHT: 79g (2.82oz)