Meprolight Tru-Dot sights for the Glock 26, 27 are up to 20% brighter than other tritium sights. The green tritium front dot is slightly brighter than the rear sight to help the shooter focus on the target. Light tubes are sealed with a patented bonding process that makes them impervious to solvents and oils. Tru-Dot sights have a 10-year illumination warranty. MEPROLIGHT combat-proven self-illuminated night sights enable you to upgrade your capabilities to hit stationary or moving targets under low-light conditions with dramatically increased hit probability.Test results by marksmen and journeymen level shooters have shown an increase of over 85% in hit efficiency, using Meprolight self-illuminated day/night sights.TRU-DOT models offer a handgun sighting system for improved rapid instinctive aiming which requires no transition from day to night use. Day and night, the shooter's aiming reference is three solid dots, identical in appearance and location under all light conditio...