Pro- Series, 1911 match combat Pro, High Force Hammer. High performance Hammer, Fusion Firearms Brand, Heat treated alloy Tool Steel. All CNC Machined parts are from Solid Bar stock with Precision Ground sear engagement surfaces, NO-MIM. These are Top Quality Professional Series Parts; Made from the best materials and processes available in today's market, Made in the USA. Will work with most all 1911 Colt style pistol models and Clones with high ride or beavertail grip safeties.