Retro Shape Frame Colour: Blue/Red and Clear Temple Colour: Gold and Clear Frame Material: Acetate Temple Material: Acetate and Stainless Steel 57-15-138 Model No: PG10C2SUN Made in Japan Nylon Category 3 Dark 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.