Stl 46 mm Piston Cylinder Assembly - 029 039 Ms290 Ms310 Ms390 Chainsaw Fuding Jingyi Rubber & Plastic Co., Ltd. Base Info Model NO.:029 039 MS290 MS310 MS390 Description Pre:Cylinder Piston & Ring Kit for Husqnarva Cylinder Assembly 48mm Diameter 365 Chainsaw Parts Next:178PCS Sockets Set-Professional-CRV Steel