Michael Kors Karlie I Eyeglasses combine a lightweight nylon frame with a flattering square silhouette, designed for everyday prescription use or as stylish non-prescription eyewear. Key attributes: Tortoise | Nylon | Lightweight frame | Durable construction | Full-rim frame | Prescription-ready (comes with demo lenses) | Square shape | Shiny finish | Dimensions & fit: Lens widths: 51 mm, 53 mm, 55 mm | Bridge: 16 mm | Temple length: 140 mm | Frame heights: 41.0 mm, 42.0 mm, 44.0 mm | Composition & care: Nylon | Wipe clean with a soft cloth. Replace demo lenses with prescription lenses at an optician.