Material:zinc alloy (black paint),two optical glass coated lenses.Rotating magnifier with black coated protective case,anti shock and not easy to get scratched up.Foldable and portable design,durable enough for your daily using.Lens Diameter:26mm/1 inch;Size:Approx 51*32*21mm/2*1.26*0.82 inch when folded, Approx 82*32*21mm/3.23*1.26*0.82 inch when unfolded;Magnification:30X.This is a very practical magnifier in life,can provide you more clear and close view for tiny objects,convenient for people in poor eyesight or for close observation.The perfect size makes this magnifying glass portable,easy to put into pocket,purse or handbag,and carry it with you to anywhere,without worrying about it being broken or frayed.Great to have one in your pocket all the time for daily using.It's really a useful and economical present for your kids,parents or friends. Your kids can use it to explore the nature, parents will never be anxious when reading little words, your friend will be happy for you are so considerate.Suitable for:reading,inspection,maps,newspaper,magazine,documents,books,directories,menus,photos,stamps,jewelry,antiques,hobbies,tasks,science class,crafts,watch making,maintenance industry,fine detail work,travel,inspecting coins,fine print,pill bottles ect.