Akoni Skyracer Sunglasses combine lightweight Japanese titanium construction with gradient CR-39 lenses and an anti-reflective finish for reliable sun performance and precise wear. Key attributes: Black iron | Matte green | Dark grey | Light grey | Titanium | Gradient CR-39 lenses | Anti-reflective coating | Category 3 sun protection | Lightweight construction | Custom titanium temples with knurling and threaded screw system | Adjustable ceramic nose pads with beta-titanium arms | Pilot-frame silhouette | Gradient lens tint | Knurling detail on temples | Dimensions & fit: Lens width 54 mm | Bridge 17 mm | Temple length 140 mm | Weight 31.9 g | Composition & care: Titanium (frame and temples) | CR-39 lenses | Ceramic (nose pads) | Beta-titanium (nose pad arms)