1. Double convex lens, high definition, improve reading comfort 2. Lightweight design, not tired of holding it for a long time 3. Can be used to magnify the image of objects, jewelry viewing, learning, reading, etc., easy to carry 4. Magnification: 3 times 5. Material: PS 6. Single weight: 40mm: about 8g; 28mm: about 4g 7. Single size: 40mm: about 9 x 4cm; 28mm: about 5.8 x 2.8cm
