High-definition professional optical glass with high durability and scratch resistance.Multi-layer nano-coating process, clear imaging, meeting high-pixel imaging standards during .Using high-quality craftsmanship, the lens is waterproof, oil-proof, and scratch-.Aviation aluminum frame material, firmly sealed, , , not affect drone calibration or balance, not fade or rust.These filters are perfect for capturing stunning professional-quality in a variety of lighting conditions, helping to reduce glare, increase color saturation and manage exposure. Take your drone photography to level with this essential accessory kit.Applicable models: for O4 Air Unit Pro/Avata2Protection performance: waterproof, oil-proof and scratch-Due to different batches, there may be differences in product appearance, color, and printed text, which not affect usColor: As ShownMaterial: CNC+Optical GlassPackage Contents:1 x ND8 Filter1 x ND16 Filter1 x ND32 Filter1 x ND64 FilterOnly above package content, other products are not included.Note: Light reflection and different displays may cause color of item in picture a little different from real thing. The measurement allowed error is +/- 1-3cm.