B07QMLZCZ5 Freewell Bright Day ??K Series ??Pack ND8/PL, ND16/PL, ND32/PL, ND64/PL Camera Lens Filters Compatible with Osmo Action Camera

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Optical Glass: 16Layers premium multicoated optical glass Scratch-resistant, Dustproof, Oilproof
Installation: Efficient SCREW-ON system for easily attaching/detaching