The Night Fision GLK001007YGZ is a top-grade product that leverages an injection molding process along with military-grade polymer. This is complemented with durable polymer tritium outlines to offer you unmatched flexibility and superior visibility in daylight. All the parts, besides the tritium vials which are imported from Switzerland, are meticulously engineered in the USA, asserting the product\'s superior quality and reliability.This night sight set includes a square front green tritium with a distinctive yellow outline, and a u-notch rear green tritium. It\'s expertly designed to fit Glock models 17/17L/19/22/23/24/25/26/27/28/31/32/33/34/35/37/38/39, assuring you of a perfect and secure fit.