Featuring market-leading Swiss tritium vials housed in ultra-strong 4140 steel and coated in highly durable black nitride, TRYBE Defense High Glow Tritium Night Sights offer reliable brightness and pinpoint accuracy, any time you need it. Not only do these night sights boast some of the brightest tritium vials on the market today with 30% more tritium than industry standard tritium vials, but the surrounding ballistic polymer yellow ring provides a glowing fluorescent contrast in both day and nighttime lighting that naturally draws your eye to the target in focus.