1Application: This cylinder piston crankshaft assembly is specially designed for Stihl 029 039 MS290 MS310 390 Chainsaw Crankshaft. 2Characteristic: The cylinder piston crankshaft has the advantages of low wear, low noise, low expansion coefficient, good heat dissipation and low fuel consumption 3Durable Material: The piston cylinder kit is made of steel and iron materials, not easy to wear, and has the characteristics of high strength, rust resistance and aging resistance. 4Stable Performance: High performance chainsaw cylinder crankshaft assembly, not easy to damage, can effectively extend the service life of your machine. 5Nice Replacement: The manufacturing conforms to the standard specification, engine motor cylinder crankshaft is a direct replacement for the old or broken one.