Square shape. - Frame Color: Leopard - Lens Color: Brown - 1 Year Warranty Technical Information: Hand Polished Width-Nose Gap-Height Measurements of this pair: 145-24-48 mm Hinge: Five-barrel Lenses Technology: ✓ CR-39 Lenses. CR-39 is made by polymerization of diethyleneglycol bis allylcarbonate (ADC) in presence of diisopropyl peroxydicarbonate (IPP) initiator. "CR-39" is an abbreviation of Columbia Resin 39. CR3-9 has the highest Abbe value of any lens. An Abbe value defines the chromatic aberration of material, and this effect is generally more noticeable in peripheral vision than when looking through the center of a lens.
