56-20-140. A stylish and functional mountaineering frame. The round lenses have a thin inset acetate ring around them that create a nice contrast next to the metal rimwire, finished with a thin cable cross bar on the front. 100% pure titanium plated in 12k, 18k or 24k gold combined with Japanese cotton-based acetate temple tips and a hidden hinge. Polarized CR-39 sun lens with a hydrophobic coating and a proprietary 12 layer anti-reflective UGR12TM coating, 99.9% distortion free, carry 100% UVA/UVB protection, block eye-fatiguing blue light, and are coated with Diamond CastTM anti-scratch coating. Individually numbered and handmade in Japan from the world’s finest artisanal craftsmen.