Night Fision's Perfect Dot sights for Canik TP9-series pistols feature design upgrades that make them brighter, more vivid, and more durable than traditional night sights. Like all night sights, Perfect Dots use self-illuminating Tritium to get the "always on" glow that makes them so effective. The difference is PDs have 30% MORE Tritium in them, so they are unusually bright. And the bold front sight draws the eye, encouraging fast, instinctive "Front Sight Focus" to keep your eyes on the target. The Tritium insert isn't surrounded by a painted-on ring, but rather one made of a daylight fluorescing material that produces optimum visibility in daylight. Mfg: Night Fision