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:Perfect Dot(TM) Night Sights with added daytime florescenceBrightest Tritium Night Sights on the marketCNC Machined out of high quality steelBlack Nitride coating used to improve wear and corrosion resistanceInstallation: Gunsmith RecommendedBuilt in the USA with Swiss TritiumFits H&K VP9, VP9SK, .45C, .45C Tactical, P30, P30L, P30SK (Excludes Optics Ready)