Optical lenses. Plastic 53mm lens width 16mm bridge width 140mm temple length. Please note: Clear, non-prescription lenses. Replacement is optional. CALIFORNIA PROP 65 WARNING. This product can expose you to the chemical. Nickel (Metallic), which is known to the State of California to cause cancer, and. Bisphenol A (BPA), which is known to the State of California to cause birth defects or oth.