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) Cylinder inside ported, clean 5) Copper gasket and complete gasket 6) Piston has an extra hole 7) Better compression function 8) HP strong crank, increaing much power and much longer life 9) Spark plug with better performance 10) Suitable for all pocket bikes