When it comes to tritium gun sights, aluminum sleeves and painted-on white rings are the norm. Night Fision breaks the mold. 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(TM), that provides maximum visibility both day and night. Pick Sight Style, Front Ring Color, and Rear Ring Color.