Machine from solid CNC steel and treated with a FORTRESS FINISH to handle just about anything. Truglo Tritium Pro Handgun Night Sights include all the advantage of their popular TRITIUM sights while adding a U-notch rear sight for increased accuracy and an angled rear sight edge to give you the tactical advantage when operating your handgun in emergency situations. SWISS TRITIUM elements provide a bright and consistent glow providing an excellent sigh picture in low-light or even complete darkness. Tritium does not require batteries – it simply glows.