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The XS Sight Systems CZ 40B Pistols 24/7 Big Dot Express Set are made for fast sight acquisition in all light conditions. Sights feature a low profile, snag free design and are easily installed. Includes a Tritium green dot front and vertical line rear sight. Tritium inserts are surrounded by a thin white line for enhanced use in daylight, Big Dot versions have a larger white outline on the front sight surrounding the tritium insert.