The sear in a Hi-Capa pistol is a crucial part as it allows the hammer to be cocked and locked.  The sear is worn down by the hammer over time and needs replacing.  This Nine Ball strong sear is made from Duralumin with a stainless steel pin and coated with a hard wearing anodized finish, furthermore the mating surface shape has been refined to reduce friction and therefore wear, plus inprove overall 'feel'.