Specification: Cylinder Inner Diameter: 57mm Overall Height: Approx.90mm Material: Aluminium Alloy Color: As the picture shows Fitment: 150cc Gy6 4-stroke Engines Gy6 QMI 152/157 Gy6 QMJ 152/157 It fits for most Chinese GY6 150cc Scooters, ATVs, Go Karts