Description: Made of optical glass material, with stable optical properties and high uniformity, Multi-layer coating, which can filter ultraviolet and stray light for clearer imaging, Waterproof, scratch-resistant, easy to install and disassemble Sturdy and durable. With excellent grinding process, good physical and chemical properties Water-proof & Oil-proof & Scratch-proof, Effectively protect filter lens. Specification: Main material: Optical glass, Color: black, Diameter: 0.8cm/0.3 inch Cleaning Steps: 1. Blow off the dust on filter surface 2. Clean again with a soft brush 3. Gently scrub the filter lenses with cleaning cloth 4. It is more effectively that cleaning with professional cleanout fluid Package Includes: 1x Lens Filter Kit (CPL MCUV ND4 ND8 ND16 ND32) : Conversion: 1inch=2.54cm, 1cm=0.393inch Please allow slightly 0-1cm difference due to manual measurement. Colors can appear different depending on light and how the listing is viewed. Thanks for your understanding and attention. Wish you a pleasant shopping experience!