Apex Gear Accu-Strike 4 Light 19 Sight Lightweight / compact design (weighs 5 ounces). TRUFLO fiber design. Extra, extra long fibers routed through bracket for increased durability & exposure to UV light. TRUTOUCH soft-feel technical coating. Innovative pin design allows for quick and easy fiber replacement. Micro push-button light included. Special light location allows for more effective light distribution to fibers. CNC-machined. Aperture has 1.8 inner diameter. Reversible bracket for greater vertical adjustability. Glow-in-the-dark shooters ring. Adjustable for left and right handed users.