Material:Resin,Plastic Size:Approx 13.8cm*14cm Futuristic, low profile design for chemical splash and impact Lens provides superior optics and peripheral vision Easiest lens replacement system available Long-term wear can effectively improve the patient's color vision, improve color resolution. As long as you are color weakne, and wear this glaes 3 months, you can help you correct the color weakne! This is a glaes pecially designed for people with red-green colorblindne and color weakne. There are special coatings on its lenses the lens is not colorle both sides of the lenses will show different colors if look at the lens from different angles the lenses will also show different colors. The effect of wearing glaes will be different for different people it will take a few days to get used to it when you first use it at the beginning of use please use it during the day for at least 2 hours a day please be patient and relax. Package includes:1 Pc Glaes Note Due to different producing batches, product details might be a little different. If you minding the difference, please buy it carefully. Please allow 1-2cm differs due to manual measurement. Due to the different display and different light, the picture may not reflect the actual color of the item. Thanksfor your understanding.