Detailed Product Description metal optical frames material: Alloy Models: For male, female and unisex Frame size: 52-18-135mm or according to your requirement Packing: 1pc/polybag, 15pcs/ inner box, 300pcs/ carton transportation: by sea or by air Metal optical frames are one of our optical frames . The materials are normally Stainless Steel, Nickel Silver, Monel, Aluminum and Titanium etc.