The Meprolight Tru-Dot Green Tritium Fixed Night Sight Set is a direct drop-in replacement for the factory sights on Ruger P85, P85 MARK II, and P89 pistols, delivering self-illuminating Swiss tritium front and rear sights with white contrast rings for fast, intuitive 3-dot target acquisition in any lighting condition — no batteries, switches, or charging required. Up to 20% brighter than competing tritium sights, the Tru-Dot's front dot is intentionally made slightly brighter than the rear to help the shooter instantly focus on the front sight for a clean, consistent sight picture day or night. Maintenance-free, all-weather, and backed by Meprolight's 12-year tritium illumination guarantee, these sights are always on and always ready right out of the box.