The filters are perfect for DJI Action 4, multi-layer coating, waterproof, anti-scratch, anti-dust, and anti-oil, and protect your equipment lens from all-around damage. Meet the dual needs of ND scrim and CPL polarizing lenses, you can choose from a variety of filter effects when shooting, including ND/8/16/32 and CPL filters Each filter is made of high-definition optical glass, which has no effect on image quality and has been ground and polished many times to form a low refractive index, ensuring the true color reproduction of the image for color-accurate photo shooting The aircraft-grade aluminum frame is laser-engraved with a matte black finish that prevents light leakage or ghosting and ensures that each filter is rigorously tested; lightweight design for burden-free shooting The knob design for safer and quicker mounting can be tightly fixed on the Action 4 during shooting, with zero possibility of loosening Equipped with a special filter case, easy to store and protect the filters, no burden to carry, change the filters you want at any time Specifications: Product size: 3.25 x 0.57cm Material: aluminum alloy frame + glass