With a body and lens hood made of black hard-anodized aluminum alloy, the internal lens elements comprise four glass elements and four groups with multiple layers of anti-reflective coating. Comes with a QR2 quick-release bayonet mount system, lens secure line, rear cap cover, neoprene dome cover and larger neoprene pouch for transport to protect its polycarbonate front dome element with hard coating. Depth-rated to 60m (200ft), it measures 99mm in diameter and 40.3mm in height, with a weight of 331g on land and 170g underwater. Optional easy-to-use, quick-release mount base for GoPro housings, or M55, M52, M46 thread adapters, sold separately.