The HIVIZ FastDot H3 Tritium/Fiber-Optic Sight Set for Taurus G3/GX4 is designed for those who need a reliable sight that is bright, easy to acquire, and fast when you need it most. This unique, low-profile single dot sight system combines fiber-optic and tritium for 24-hour illumination. Leave behind the batteries and the bulk, stay on target with the FastDot H3!