Manufactured by JUN and cooperated with Wossner in Germany, This W series is an excellent product in the cost performance. Only for F20 Engine. This is a forged piston. Form is for convex, Weight 368g, Pin diam 23mm, Capacity 9.1, Pin height 30.0mm. Piston rings, Piston pins, Snap rings are included. Choose the Bore size 87.0, 87.5 or 88.0mm.