46-21-140 or 49-18-140 without inset. The round lenses have a thin inset acetate ring around them that creates a nice contrast next to the metal rim wire. 100% pure titanium plated in 12k silver, 18k gold, or 24k gold combined with Japanese cotton-based acetate temple tips and a hidden spring hinge. Polarized CR-39 sun lens with a hydrophobic coating and a proprietary 12 layer anti-reflective UGR12™ coating, 99.9% distortion free, carry 100% UVA/UVB protection, block eye-fatiguing blue light, and are coated with Diamond Cast™ anti-scratch coating. Individually numbered and handmade in Japan from the world’s finest artisanal craftsmen.