Features: 1) Higher performance racing cylinder with cut head 2) Top quality aluminum with red color, silver color and blue color The cylinder is also top quality. The kits are so smooth, stronger, shining and attractive. The kits are much better than others 3) The fin and 4 screws are much stronger 4) Our logo YY-MOTO is carved on it and we are the real and original manufacturer 5) Cylinder inside ported, clean 6) Copper gasket 7) Piston has an extra hole 8) Better compression function 9) Crankshaft is strengthened for your options 10) Spark plug with better performance 11) Suitable for all pocket bikes