Motorcycle 520 Chains 43T 58mm 125mm Sprockets Rear Back Sprocket Cog Fit For Karting ATV Motorcross. Made of high-quality materials, durable and practical. Perfect replacement for damaged and worn sprockets. Better riding experience can be obtained after installation. 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.