Feature:1. Vehicle Fitment: Chain rear sprocket set is specially designed for Z50A Z50 Z50R Z50J Monkey Bike, direct replacement, perfectly fit your bike.2. Kit Including: The kit includes 1pc 3 hole 420 29 tooth rear sprocket, 1pc 420 chain 78 links and 1pc 420 14 tooth chain flywheel to meet your repair needs.3. Smooth Operation: The precisely manufactured sprocket chain kit ensures smoother monkey bike start and smoother operation, reducing horsepower loss.4. Steel Alloy Materials: Adopting steel alloy material, with high machining accuracy, can provide higher durability and reliability, long service life.5. Direct Replacement: The kit is ideal for upgrading your mini bike to a whole new level, making your motorcycle look more modern, perform better and ride more enjoyable.Specification:Item Type: Chain Sprocket KitMaterial: Steel AlloyFitment: Fit for Z50A Z50 Z50R Z50J Monkey Bike.Package List:1 x 420 78 Chain Links 1 x 420 14 Tooth Chain Flywheel 1 x 3 Hole 29 Tooth Rear Sprocket Note:Please measure the size before buying to make sure it fits your vehicle