FUNCTIONAL XRAY3 SIGHT SET - Compare the X-RAY3 to other conventional sights and you will see the blacked-out rear sight and the high contrast front sight of the X-RAY3, make target acquisition intuitive and fast and in any light condition 3-DOT SYSTEM - This 3-Dot system has a superior glowing illumination in low-light and remains bright for daylight conditions; no more changing sights from night to day patrols, keeping your sights consistent for all your work or hunting light conditions DURABLE CONSTRUCTION - The steel surrounds the sights and gives them protection from recoil and protects from cleaning solvents and the harsh elements; whether you carry for work or for sport, these X-RAY3 sights will be bright for over a decade SMOOTH PERFORMANCE - Oversized chemical resistant fluorescent polymer front dot gives confidence in any environment; sights come in standard SIG SAUER sizes of #6 and #8 in square or round (U)notched rearsight