This handy little pocket magnifier has a great magnification of 10X. It is comprised of a pair of clear, plastic, convex lenses, mounted in a black plastic ring with a diameter of approximately 22mm. It folds completely in a metal frame for good protection against scratches. The overall length is about 56mm when fully opened. It is great for field use or to study all those little things that are just to small to see with the naked eye around the house.