Features: 1.Fitment: Our cylinder piston kit is precisely engineered and produced on the base of original standards, perfect replacement for Stihl MS181 MS211 MS181C MS171. 2.OEM: The OEMs of our cylinder piston kit are 1139 020 1201 and 1139 030 0401 for reference, please check the part number of your item before purchasing. 3.Excellent Performance: Our cylinder piston kit improves heat dissipation, and has strong driving force, but with low noise and fuel consumption during operation, making the engine run more smoothly without burden. 4.Longer Service Life: Our cylinder piston kit is made from die cast aluminum, which is not easy to break, anti aging, anti rust and wear resistant, durable enough for supporting a lasting time. 5.Direct Replacement: The superior cylinder piston kit is especially designed for STIHL chainsaw with high accuracy and perfect fitness to meet your demands, allowing you to directly replace the old or damaged part. Specification: Item Type: Cylinder Piston Kit_x000D_ Material: Aluminium_x000D_ OEM: 1139 020 1201, 1139 030 0401_x000D_ Cylinder Bore: 38mm_x000D_ Fitment: _x000D_ Fit for Stihl MS181 MS211 MS181C MS171 Note: 1. Please double check the part number of your item, matching information is for reference only._x000D_ 2. If you are unsure of the item, please contact us before buying to avoid unnecessary return, thanks!