This listing is for the following product: 18 Tooth Front Sprocket, this sprocket has a 530 pitch and will fit the following models: 1973 1974 1975 Yamaha RD-350 RD 350. All Race-Driven Sprockets are manufactured to meet or exceed OEM specifications and are produced using hardened S45C steel. Please make sure when purchasing sprocket(s) you do so according to your motorcycle and riding style.