How many kinds of sunglass frames are there?
Sunglasses frames are made mostly of three materials-plastic, nylon and metal. Plastic is mostly found in the less expensive sunglasses. If you like plastic frames, then choose plastic reinforced with a metal rod or otherwise the plastic frame may crack easily. Nylon frame is always a good choice because it is flexible, light and strong with a tendency to return to its original position. Metal is also a good choice because of the strength. The main drawback of the metal frame is that they will bend and break more easily than nylon.
