1、Metal Frame: The filter frame is made of aluminum alloy material, which extends the service life of the filter, ensures the hardness and reduces the weight. 2、Silicone Protection: The part in contact with the lens is made of silicone material, which can effectively protect the camera lens and have a fixed effect. 3、Optical Glass: The lens is made for SCHOtt glass, the surface is multi coated, has a high uniform refractive index and high refractive index, color fidelity, no dark angle. 4、Simple Operation: With a snap, simple and fast operation, no complicated steps, quick installation step, to provide you with convenience. 5、Action Camera Filter Set: Our filter set includes CPL filter, ND8 filter, ND16 filter, ND32 filter to meet your daily use needs.