... 10 years. 3.Own stable customers 4.Material:acetate Detailed information:1.Our products :medium and high ... frame .2.Materials:stainless steel, metal memory ,plastic memory ,acetate ,sillicon ,aluminium,copper.cupronickel ,monel,high nickel.3.Packing ... quality products to our customers. Excepted we produce optical frame suach as lady's frame ,man's ... about us . good quality of hand made optical frames