Beretta APX Tritium Night Sights for pistol model APX. Professional installation required to maintain warranty coverage.Precision machined metal body that hold the tritium gas filled lamps Glows bright green in the dark and have white outlines that show as white spots in the daylightImpervious to solvents and punctureIf marked "H3" on metal site then the product contains tritium gas and is a "night sight" Night Sights are regulated by the US Nuclear Regulatory Commission. The sight shall not be disassembled or exportedThe original owner of this product is entitled to replacement or repair (at our option) if the sight fails (a total loss of illumination) due to defects in material or workmanship during normal use for a period of 5 10 or 12 years depending on the product model.