The Mankind Control Alloy Sprocket is made out of forged 5mm thick 7075-T6 aluminum with 1/8” teeth, has a 15/16 Bore, with 19mm and 22mm adapters included. ###section### Product Specs TYPE: Bolt On MATERIAL: Forged 7075T6 Alloy WEIGHT: 62 Grams (2.19oz)