Stens,Cy Nder Assembly Stihl 4238 020 1202 Pack Size-1 Replaces Oem- Stihl 42380201202 Fits Models- Stihl Ts410 And Ts420 Cutquik Saws Specifications- 50Mm Bore, Cy Nders Come Complete With Piston, Rings, Pin And C Ps Not Compatible And Warranty Void With Equipment Using Greater Than 10 Ethanol-Blend Fuel .