Meprolight Hyper-Bright, Tritium Sight Set, Green Front/Green Rear, For Glock Standard Frame 9/357SIG/40/45GAP 0402243111 It's the world's brightest handgun sight in any light. With tritium specially formulated to give you industry-first brilliance from broad daylight to midnight. These self-illuminated" fixed tritium sights feature an extremely bright colored ring front sight in your choice of green" yellow or orange" delivering supreme visibility as a night sight or day-night sight. Contrasting front and rear sight colors help shooters focus on the front sight quicker for faster target acquisition in all lighting conditions. Because you can't predict when everything will depend on your sight's visibility" but you can count on Hyper-Bright by Meprolight. Every time.