This piston ring kit is designed for 78mm cylinder bore applications and is compatible with CRF250R (2004–2007) and CRF250X (2004–2009, 2012–2013) models.The kit includes all necessary components for a standard engine rebuild and serves as a replacement for OEM reference part numbers 12100-KRN-670 and 12100-KRN-732.Constructed from metal materials, it ensures and performance.The package contains one complete piston ring set.Please note that this product is a compatible replacement part and is not manufactured or endorsed by.Actual product color may vary slightly due to and screen settings.Measurement tolerances of +/-1 to 3 cm may apply.