25H 136 Links Chain + 68 Tooth Rear Sprocket,Fits for 2-stroke 49cc Pocket Bike Mini Bike. Package Includes:1 X 25H 136Links Chain;1 X Rear Sprocket; 3X 25H Links . About the chain??Combination of a very high strength base material and an exceptionally hardwearing surface result in significantly increased chainwheel life.Chain repeated forging, strict control of materials to ensure the strength,easy to disassemble, easy to clean, reusable. About the Rear Sprocket:Their advanced tooth profile, concentricity and accuracy of fit provide maximum power transfer and long-life. Professional after-sales Please check the description to confirm the compatibility before purchase. Thank you! if you have any problems or concerns, please kindly send us mail any time, we will provide you with solutions as soon as possible.