HEXAGONAL FLAT LENSES Sunglasses in Arista Gold and G-15 。Barely used—perfect condition! 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 meets 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 colour 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.