Mepro Hyper-Bright fixed pistol sights feature an extremely bright contrasting colored ring front sight. The tritium is illuminated green to provide low-light and nighttime aiming capabilities. The contrast in colors of the two components helps the shooter focus on the front sight quicker, which is critical in defensive and competitive shooting.Specifications and Features:Fixed Pistol SightsSuper Bright Day and Night SightNo Batteries or SwitchesTritium PoweredVisible 24 Hours a DayFront Sight: Orange RingRear Sight: Green DotsFits:Sig P225, P226, P228, P239, and P320 Pistols in 9mm Luger and .357 Sig