Lens Colour: Grey Lenses with Beige Horn Curves Temple Colour: Clear Temple Material: Acetate with Steel Hinges Model No: WVB6C2SUN Made in Japan Nylon Category 2 Medium Tint Lenses - Grey Nylon is a newer top-notch performance material; it combines the advantages of polycarbonate and CR-39 lenses. Nylon lenses have an outstanding shock resistance while being extremely lightweight and do not crack when drilled, making them perfect for some frame shapes. This is an exclusive collaboration with Linda Farrow that produced the Sunglasses to their highest standards.