1.Every product has a unique Manufacturing Part Number label on the inner package that proves it has been qualified,which include Part Number,Model Number and inspection date incompatiblemation;2.If you have any questions about the item,please provide us the Manufacturing Part Number compatible checking,your profits will be guaranteed.3.The piston set of the air compressor 47 is made of metal. The colors are silver and black. Size: Piston diameter 47MM, height 40MM, bore 12MM, piston ring oil ring thickness 3MM, gas ring thickness 1.5MM, piston pin length 38.5MM, diameter 12MM circlip: 13MM.4.Suitable compatible air compressors.5.The accessories include a piston, a piston ring oil ring, two gas rings, a piston pin and two circlips.Specifications:Material:MetalColor:Silver and BlackSize:4.7 x 4cm/1.85 x 1.57inch(D x H)Piston diameter 47MM, height 40MM, bore 12MM, piston ring oil ring thickness 3MM, gas ring thickness 1.5MM, piston pin length 38.5MM, diameter 12MM circlip: 13MMWeight:98gPackage include:1 x Piston1 x Piston Oil Ring2 x Gas Rings1 x Piston Pin2 x Circlips