What do you get when you cross a circle with a square. You get the hexagonal RB3548N, the evolution of round featuring flat crystal lenses. Round has met flat, when it comes to lenses that is. Hexagon shape looks great on oval, square, and heart shaped faces. Wisteria Flash lenses reduce glare for greater visual comfort. Lens: 48mm Bridge: 21mm Temple: 140mm. Country of origin: Italy/China.