Frame/Temple Colour: Tortoise Shell Frame Material: Acetate with 925 Silver Hinges Temple Material: Acetate with 925 Silver Temple Tips and Branding Size: 58-17-135 Model No: AD1C2SUN 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.