Material:Zinc alloy (black paint),two optical glass coated lenses,lightweight and tiny,foldable and portable.The magnifier is the ideal tool for zooming in home,office,classroom,laboratory and travel. Lens Diameter:36mm/1.42 inch;Size:Approx 40*30mm/1.57*1.18inch;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,great to have one in your pocket all the time for daily using. Handsfree or handheld zoom up loupe,you can place it on desk as a mini paperweight magnifier,or grap it in hand to read small prints.Best gifts for those who love to explore the tiny world. 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.