Piston and piston ring set compatible with 6.50cc, 60cc, 80cc, 100cc, 125cc, 150cc engine kits, suitable for RL , motorized bicycles, and motorcycle engine parts.This replacement piston set is designed for use in small displacement engines and includes a piston with connecting rod and piston rings.It fits standard cylinder bore sizes commonly found in aftermarket engine upgrade kits.The components are engineered for consistent performance in two-stroke and four-stroke applications.Ideal for restoring or upgrading the internal combustion system of compatible vehicles. This replacement part is manufactured independently.All brand references are used solely to denote compatibility with listed models.