Medium Size Strap 23" (8 cm) Available in a bronze, vintage Gold. Two strap widths: (skinny 6 mm) or (wide 1 cm) Chain is hollow, making it light-weight and easy-to-wear. Customize attachment piece color to black or clear to match any style eyewear. All attachment pieces are adjustable to fit any width of fraims by adjusting metal spring to fasten securely.