This piston and rings kit includes part numbers EJ7Z-6108-A, EJ7Z6108A, and EJ7Z-6135-A, and is designed for use in 2015-2019 Focus, Mustang, and MKC vehicles with 2.3L EJ7Z6108E engines.The set contains four cast aluminum pistons with a diameter of 87.5mm, four steel piston rings with standard 0.00 specifications for effective cylinder sealing, and necessary hardware for installation.Piston pin diameter is 22mm to secure fitment.This kit is engineered to support consistent engine performance and reduced cylinder wear when installed in compatible vehicles.