Ultra-slim frame, only 5.3 mm thickness. CNC-non slips pattern helps install and remove the filter easily. Double side 28 multi-layer coatings hydrophobic, anti-oil, anti-dust, anti-soil, scratch-resistant. Ultra-slim rim profile to avoid vignetting on wide-angle lenses, while maintaining rotation capabilities to adjust polarization levels. Extra tough lightweight aluminum-magnesium alloy frame ensuring great durability and jamming prevention. Circular CPL filters allow you to remove unwanted reflections from non-metallic surfaces such as water, glass, etc. Also can enhance the color and contrast. Often be used to increase the contrast and saturation in blue skies and white clouds. NOTE: This filter is compatible with all 72mm lenses. Your camera's lens thread size will be marked somewhere on the lens barrel or printed underneath your lens cap. This number is always preceded by a "" (diameter) symbol. For example, 72= 72mm lens thread size. New and old packages are sent randomly CPL filters are good for skies, waters, foliage, and the like. They can dramatically enhance these natural elements, giving images better appearance.