54-21-145. A larger rectangular frame with a classically inspired keyhole bridge. Two hexagon pins on the corners of each side create a modern interpretation on the classic pin dècor. 100% pure titanium plated in 12k silver or 18k 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 coated with Diamond Cast™ anti-scratch coating. Individually numbered and handmade in Japan from the world's finest artisanal craftsmen.