Night fision utilizes an injection molded process and military-grade polymer with durable polymer tritium outlines to give you flexibility and unrivaled daytime visibility.With the exception of the tritium vials imported from switzerland night fision products are crafted end-to-end right here in the usa.This night sight set is a square front green tritium with a yellow outline u-notch rear green tritium and fits glock models 17/17l/19/22/23/24/25/26/27/28/31/32/33/34/35/37/38/39.Rear Color: GreenType: Front/Rear SetFrame Material: PolymerFrame Color: BlackFirearm Fit: Glock 17 17L 19 22-28 31-35 37-39Style: Square Front/U-Notch RearFront Material: TritiumRear Material: TritiumFront Color: Green Tritium w/Yellow OutlineWindage Adjustment: NoElevation Adjustment: NoFirearm Type: Handgun