What do you get when you cross a circle with a square? You get the hexagonal RB 3548N, the evolution of round featuring flat crystal lenses.Round has met flat, when it comes to lenses that is. This hexagonal round metal shape features thin coined profiles and flat crystal lenses on classic gold with extremely thin temples. Mix and match flash base color options to create the perfect combination. Experience the thrill of wearing an updated classic that will never make you feel like a square peg in a round hole.