It is eyewear accessory of Eyeglasses frames.
Protect the optical frame to avoid out of shape.
AC of Copolymer will be never cracking for rimless frame.
1) Diameter: 55mm, 60mm, 65mm, 70mm, 75mm, 80mm
2) Thickness: 1.0mm, 1.3mm, 2.0mm, 2.3mm, 2.5mm, 3.0mm
3) Base:300, 400, 500, 600, 800,...