Kirk Originals' square Burton sunglasses are made of glossy black acetate. Fitted with green gradient lenses, this chic pair is handcrafted in England using a bespoke process that requires 72 hours of work. Handmade. Square shape. Nose guards. Two round silvertone metal pins at temples. Green gradient lenses. 63mm eye size. 19mm bridge size. 146mm temple size (approximately). Available in Black. Acetate. Made in England. Kirk Originals Men's Burton Sunglasses - Black A great designer gift. Shop Kirk Originals at Barneys New York.