When it comes to tritium gun sights, aluminum sleeves and painted-on white rings are the norm. Night Fision breaks the mold, literally. Our patent-pending injection molded sleeve design not only holds our tritium vials securely in place, it creates a brighter and more durable ring, we call The Perfect Dot™, that provides maximum visibility both day and night. Features: Perfect Dot™ Night Sights with added daytime florescence Brightest Tritium Night Sights on the market CNC Machined out of high quality 4140 steel Black Nitride coating used to improve wear and corrosion resistance Installation: Contact Professional Gunsmith Made in USA with Swiss Tritium