This is a new set of type 4 2.0 liter 96mm flat top je pistons & cylinders. Je forgings are made from 2618 aluminum, they have a 0 offset with extra material under the top for the valve pockets. This set comes with a 34.6 mm compression height and the 24 mm pin. The slightly smaller compression height allows you to easily build small stroked engines 71 to 78 mm with the standard length rods that have the 24 mm pins.