-Front & Rear Night Sight Combo-Fits Smith & Wesson M&P-Front sight has tritium surrounded by Lexan sleeve, that appears white during the day & glows green at night-Rear sight contains optical Lexan ghost ring insert which will glow during daylight & low light conditions (doesnot glow continuously at night like tritium) as well as 2 tritium inserts on either side surrounded by Lexansleeve, that appears white during the day & glows green at night-Rear sight is a press fit application & should be done by a professional gun smith to avoid potential harm toslide or sight-All necessary roll pins & screws provided