The Stihl 42388937000 is a genuine OEM piston ring designed for optimal performance and durability in Stihl engines. This essential engine component ensures proper compression and sealing within the cylinder, crucial for the efficient operation of Stihl cut-off saws and blowers. It is a direct replacement part, maintaining the original equipment specifications for a perfect fit and reliable function. This piston ring is compatible with a range of Stihl models including TS400, TS410, TS420, TS460, TS500i cut-off saws, and SR430, SR450 blowers.