1.These hardware parts are compact in structure and high in hardness, suitable for Stihl MS440 gasoline chain saw. 2.Perfect chain saw accessory, with a piston diameter of 50mm, is easy to install and use. 3.Universal cylinder piston kit, made of special materials, with good wear resistance and long service life. 4.The cylinder piston assembly and accessories have high accuracy, which can effectively improve the performance of the chain saw. 5.Produced by a professional after-sales factory, with exquisite workmanship, can perfectly fit your chainsaw equipment. Condition: 100% Brand New_x000D_ Item Type: Cylinder Piston Kit_x000D_ Cylinder Material: Die-Cast Aluminum_x000D_ Piston Material: Aluminum_x000D_ Cylindrical Pin Material: Alloy Steel_x000D_ Piston Ring Material: Ductile Iron_x000D_ Circlip Material: 65Mn_x000D_ Cylinder Coating: Chrome Plating_x000D_ Application: For Stihl MS440 Cylinder Assembly_x000D_ Piston Diameter: Approx. 50mm / 2.0in 1 x Cylinder1 x Piston1 x Cylindrical Pin2 x Piston Ring2 x Circlip 1.Please allow 0-1 inch error due to manual measurement. Thanks for your understanding._x000D_ 2.Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.