For 47cc 49cc Motorcycle Front Gearbox Sprocket T8F 11T 13T 14T 17T 20T Small Sprocket. Sprocket helps reduce friction when the chain turns on the sprocket teeth. It will helps prevent premature chain wear and prolongs its lifespan. The Sprocket simplifies the installation process, providing users with a convenient and time-saving setup. Easy to install and replace the broken one, no special tools needed. Made of good material, durable, not easy to rust and not easily deformed,for long time to use.