Improper cleaning of sunglasses or glasses can often lead to scratches. For instance, never use paper towels - they are abrasive and can create surface scratching. this purple microfiber case can double as proper cleaning cloths, preventing scratching on the surface of lenses. They can also be used to carry other small items, such as pens or pencils, small digital devices, or marbles. The drawstring has an easy-to-operate locking ball. Measures 3.7 X 7 in./ 96 X 175mm.