This monocular style (4X) has a large 35mm diameter lens for a wide field of view. Features prescription-grade aspheric lens made of PXM optically pure plastic, which is lighter than glass and more resistant to breaking. Lenses are coated with Cera-Tec on both sides to resist scratching. Clip mechanisms are made of lightweight, well-balanced fiberglass-reinforced plastic for comfortable hands-free viewing, even over long periods of time. Includes four soft rubber clip sleeves that protect your glasses from scratches. Packaged in hard plastic box with lens cleaning cloth. Meets EN ISO 9001 standards. Backed by a one-year manufacturer’s warranty.