Our blue light glasses have specially crafted lenses that filter out the blue light from your phone and computer screen. By using them there is a good chance your eyes will feel more rested and you will have a better good night sleep. Our glasses block out 30% of the blue light, which is recommended for everyday use. The Zebbe glasses has a black frame made from 100% recycled plastic.Specifications:- Fit: Large- Measurements: 47mm / 13mm / 140mm- Material: Recycled Plastic