Ultra lightweight / compact design (weighs 3.6 ounces). Ultra-tough composite construction. Innovative pin design improves sight picture and protects fibers. Quick and easy fiber replacement. Aperture has 1.8� inner diameter. Large circular field of view. Includes level. Reversible bracket for greater vertical adjustability. Glow-in-the-dark shooter�s ring. Adjustable for left and right handed users. Accepts any Apex Gear or TRUGLO light (sold separately).