TruGlo introduced Apex in 2007. The Inferno Five Pin sight comes standard with an LED light source. This is a wrapped fiber optic sight with .029-inch-diameter fibers. I get nervous when I see fiber optic sights with poorly protected, vulnerable fibers between the spool and the pinhead. This is not one of them. Apex encloses the fibers in tiny metal tubes with a low-profile shield that further guards them from rough handling and collisions with branches. The sight is fully adjustable to fit any bow and anchor point combination.