APO System: apochromatic objective lens system corrects for color across aberrations across the spectrum; Optically Indexed Lenses deliver optimum image sharpness and brightness; Premium HD (High Density) extra-low dispersion glass delivers the ultimate in resolution and color fidelity; XRPlus Fully Multi-Coated Optics increase light transmission with multiple anti-reflective coatings on all air-to-glass surfaces; Plasma Tech: cutting edge application process provides unparalleled coating durability and performance; Constructed from a solid block of aircraft-grade aluminum for strength and rigidity; Waterproof, fogproof and shockproof; Ultra-hard, scratch-resistant ArmorTek coating protects exterior lenses from scratches, oil and dirt; ECR-1 MOA Reticle; Matte Black Finish