The ColorVision dark gray lens is one of a kind due to its distinctive color and style. This is the ideal option for you if you've always desired gray eyes with a hint of boldness. Details of the product material of the lens: Hima 55 55% of the water is water. Base Curve: 8.6 Center Diameter: 14.2 0.04 in thickness Contents of the package: a pair of lenses Use period: up to 14 hours per day for a maximum of two months