ITEM NAME:Cylinder Piston Kit for 66cc, 68.5cc, 70cc or 80cc 2-cycle Motorized Bicycle Description: High Performance cylinder Head with pin and rings. Material: Metal. Bore Diameter: 47 mm / 0.15 inch Height: 60 mm / 0.2 inch Fitment: for 66cc, 68.5cc, 70cc or 80cc 2-cycle motorized bicycle engine. Package Includes: 1 Piece Cylinder 1 Piece Pin 2 Pieces Rings.High Performance cylinder Head with pin and rings. 1 Piece Cylinder. 1 Piece Pin.