This Genuine Tohatsu Marine Part is a piston ring set that is designed to fit specific Tohatsu outboard motors. It is an oversized set, with a 0.5 O/S measurement, which means it is slightly larger than the standard size. The part number for this set is 3E3-87124-0. These piston rings are essential components in the engine's combustion chamber, providing a tight seal between the piston and cylinder wall to ensure optimal compression and efficient power delivery. Made with high-quality materials, this Genuine Tohatsu Marine Part is built to withstand the demanding conditions of marine environments and deliver reliable performance.