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John, they are fiber optic/tritium night sights, more about them here on the TruGlo site: http://www.truglo.com/firearms-handgun/brite-site-tfx-handgun-sights.asp?catid=E5FDB84FE8F74C239330C1841BDD3D5E

John, Trueglo TFX Sights are a "Hybrid" of Fber Optic and Tritium sights that give you the best sight picture in both day and night.