Fuse Lenses for Costa Del Mar Stringer Plastic frame Plastic lens Polarized lenses Lens width: 55 millimeters Fuse Midnight Mirrored Tinted Lenses. Subtle Dark Blue Metal Mirror Coating over a grey lens base. Warm grey view. Grey tint gives true color perception. Fuse Force extra dense scratch resistant hardcoating. Non-polarized lenses Completely block harmful UV rays, providing 100% UV protection Fuse Force scratch resistant hard coating Lens Category 3, Ideal for Bright Light Custom Made to easily interchange with your current sunglasses.