Costa Del Mar Harpoon C-Mates Polarized Bi-Focal Reading Glasses Nylon frame Plastic lens Polarized Lens width: 60 millimeters Lens height: 51 millimeters Bridge: 22 millimeters Arm: 120 millimeters Comfortable large fit Stainless steel integral hinge Heavy-duty TR 90 nylon frame. Includes hard case Plastic lenses are lightweight, impact- and scratch-resistant