When it comes to tritium gun sights, aluminum sleeves and painted-on white rings are the norm. Night Fision breaks the mold, literally. Their patented, injection molded sleeve design not only holds the tritium vials securely in place, it creates a brighter and more durable ring, they call The Perfect Dot(TM), that provides maximum visibility both day and night.Features:Brightest Tritium Night Sights on the marketDomed lens collimates tritium rays for a sharper sight pictureCNC Machined out of high quality steelBlack Nitride coating used to improve wear and corrosion resistanceInstallation: Gunsmith Recommended, for Installation Information please review our Install GuideBuilt in the USA with Swiss Tritium