**********TR90 & Metal & Spring Hinge frame*****Polycarbonate lens*****Non-polarized*****Lens width: 52 millimeters*****BLUE LIGHT FILTER GLASSES-Blue light blocker & UV400 lenses help you resist 100% harmful blue light & UVA/UVB rays, reduce discomfort from web surfing, gaming and working under fluorescent lights. Restore true color, eliminate reflected or scattered light. Cut glare headache eyestrain to protect your eyes and help sleep better. *****ULTRA LIGHTWEIGHT TR90+METAL FRAME-Extremely durable and super light, you can barely feels its presence, which makes it comfortable to wear for a long time. Classic design, it is suitable for both women and men, high grade of frames. Let help you decorate your day! *****FLEXIBLE SPRING HINGE DESIGN-Suitable for all face types. Whether your face is oversized, narrow, or medium, it can easily solve your problem. The arbitrarily swingable spring leg design also reduces the squeezing of the glasses to the head. Good protection for your eyes and head!