OEM cylinder assembly from Stihl. Includes a piston (QS 1128 030 2051), 2 rings (QS 1122 034 3000), piston pin (QS 1128 034 1501), circlips (QS 9463 650 1200), stud (QS 0000 953 0807) and cylinder. Gasket (QS 1125 149 0601) and compression valve (QS 1128 020 9400) are sold separately. We recommend using a piston ring clamp set when changing cylinders.