Lens Shape: Square Material: Metal, Titanium Prescription lenses are installed. The prescription strength is unknown. Model Number: RB8691 1097 55□16 140 The left screw is slightly rusty, and the right screw is missing. However, there are no problems with use. Since the prescription strength is unknown, the buyer will need to replace the lenses with ones that suit them. Other than that, there is almost no sign of use overall, and they are very clean. Please comment if you have any questions.