Truglo's brite-site tfx features fully-protected tfo technology encapsulated in a virtually indestructible configuration, impervious to oils, chemicals, cleaning solvents, and ultra-sonic cleaning processes.The sights provide unmatched visibility in all shooting conditions, 24/7, utilizing swiss tritium for maximum brightness.Glowing in the dark without the use of batteries, the concealed fiber cannot be seen by target.Additionally, tru-glo's fortress finish provides a permanent protective coating for maximum protection and this snag-resistant design fits standard holsters.The tfx pro sights feature a quick and accurate u-notch design, glow-in-dark sights, a contrast colored front sight focus lock ring for even faster focus, and an angled rear sight for one-hand operation.This model is compatible with walther ppq.Rear Color: GreenType: Fiber Optic Front/RearFrame Material: SteelFrame Color: BlackFirearm Fit: Walther PPQStyle: U-NotchFront Material: Tritium/Fiber OpticRear Material: TritiumFront Color: Green Tritium/Fiber Optic w/Orange OutlineFirearm Type: Handgun