TRUGLO Carbon Xs Sight 4 Pin with Light 19 Sight Ultra lightweight carbon-composite construction. TRUTOUCH soft-feel technical coating. Micro push-button light. TRUFLO fiber design. Extra, extra long fully-protected fibers. Large circular field of view. Aperture has 1.8" inner diameter. Level with two vertical bars. Reversible bracket for greater vertical adjustability. Glow-in-the-dark shooters ring helps align peep sight. Adjustable for left and right handed shooters.