Frame Material: Nopal frame handmade from zyl acetate. | Hardware: Five barrel hinges with a wire core embedded in each temple for strength.| Lens: Bronze Polarized CR-39 lenses manufactured by Carl Zeiss Vision. Featuring 100% UVA/UVB protection and 6 base curve. | What's In The Box: Includes a premium hard sunglass case and custom printed polishing cloth.