The tfx features fully-protected tfo technology encapsulated in a virtually indestructible configuration, impervious to oils, chemicals, cleaning solvents, and ultra-sonic cleaning processes.These 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.This model has a fixed front with a f.A.S.T rear and is compatible with glock 17,17l,19,22,23,24,26,27,33,34,35,38,39,45 excluding mos models.Rear Color: BlackType: Front/Rear SetFrame Material: SteelFrame Color: Nitride FortressFirearm Fit: Glock 34Style: Square Front/F.A.S.T RearFront Material: Tritium/Fiber OpticRear Material: SteelFront Color: Green with Orange OutlineFirearm Type: Handgun