Features: 1.OE Number: The referencing OE number of this cylinder head piston kit are 1123 020 1209, 1123 030 0408, which is molded depend on the original data. 2.Fitment: The 42.5mm cylinder piston kit is a replacement for Stihl MS250 MS230, please check the model of your chainsaw before ordering. 3.High Performance: The cylinder can work normally under harsh conditions, effectively improve engine displacement, performance, horsepower and torque! 4.Advantages: Low noise, low expansion coefficient, improved heat dissipation, strong power and low fuel consumption, lower friction surface as well as long service life. 5.Material: Made of die cast aluminum material, high strength, not easy to deform, strong impact resistance, which can reduce engine shake and make driving more stable. Specification: Item Type: Cylinder Piston Assembly_x000D_ OE Number: 1123 020 1209, 1123 030 0408_x000D_ _x000D_ Material: Die cast aluminum_x000D_ Cylinder Diameter: Approx. 42.5mm/1.67in_x000D_ _x000D_ Fitment:_x000D_ Replacement for Stihl MS250 MS230 PackageList: 1 x Cylinder 1 x Piston 2 x G Ring 1 x Pin 2 x Gasket Note: Please double check the part number of your item, matching information is for reference only._x000D_ If you are unsure of the item, please contact us before buying to avoid unnecessary return, thanks!