Fits: Fits Husqvarna 361, 365, 371, 372, 372xp chainsaws and 371K chop saws. Features: – Round intake port on cylinder and decompression valve port. – These pistons are impressive, they typically add at least 10 psi to the compression compared to the original flat top piston. More compression means more power. Please note: This kit will not fit the new x-torque engines made 2010 and newer (372xp x-torq and 365 x-torq). We have other kits that will fit x-torq saws. Package includes: 52mm Nikasil coated cylinder piston 2*ring slots 1*Caber rings 1*pin 1*retaining rings 1*gaskets 1*Oregon spark plug. Without instruction manual. Notes: If you are not sure whether the item is 100% fit for your car before purchasing. Please allow 1-3cm difference due to manual measurement. Due to the difference in display and light, the picture may not reflect the actual color of the item. Thank you for your understanding.