Trijicon's Bright & Tough Night Sights feature a white ring around the glowing dots for daytime visibility, and for illumination in no light or low light conditions, a tritium-phosphor lamp protected within an aluminum sleeve and capped with a sapphire jewel to evenly distribute light and protect from solvents and puncture. Bright & Tough Night Sights have a metal body with a silicone rubber cushion for shock protection to the tritium-filled glass lamps. This night sight set is taller, designed to work with a suppressor. It fits Glock models: 17, 17L, 19, 22, 23, 24, 25, 26, 27, 28, 31, 32, 33, 34, 35, 37, 38, and 39.