XS Big Dot's Tritium Offer You Superior Front Sight Visibility in a All Lighting Conditions XS Sights Systems Shotgun sights are a crucial addition to any defensive shotgun. Utilizing a better front sight set up on your defensive shotgun can provide you with a distinct tactical advantage in any lighting condition. The sight features a green tritium vial that will glow in low light situations while the orange will take over really well in bright light conditions. XS Sight Systems Tritium Big Dot Shotgun Front Sight (Orange) Specifications and Features: XS Sight Systems SG-2004-3N Tritium Big Dot Front Sight Orange Front Circle Green Tritium Vial Improves Sight Acquisition High Contrast Sight Picture Great in All Light Conditions Epoxies over existing front bead Easy Installation Metal Housing Matte Black Metal Finish Includes: Tritium Big Dot Orange Bead Sight Fits: Shotgun Front Bead Sight with a Diameter of 0.125" to 0.140" If your bead is not in that range then Either #6 or #26 aftermarket beads are recommended.