Fit For Surron Light Bee Dirt Bike 420 Sprocket Set Sprocket helps reduce friction when the chain turns on the sprocket teeth. It will helps prevent premature chain wear and prolongs its lifespan. Easy to install and remove,the sprocket gear design kit is simple, light and small, easy to carry and use, convenient and practical. 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.