Complete set of springs to improve reliability, smooth trigger pull, and improve accuracy. Includes reduced power mainspring and sear/bolt spring, extra power base pin spring, stainless steel ejector spring. Wire features wire sear/bolt spring; flat uses traditional flat sear/bolt spring. Mfg: Wolff SPECS: Spring steel. Colt/EMF fits Colt Cowboy and Single Action Army, EMF Hartford. May require minor fitting.