The 3-filter neutral density kit was put together by Tiffen for the DJI Mavic Air to offer multiple aperture and shutter speed options for Mavic air operators. The kit comes with 0.6, 0.9, and 1.2 neutral density filters that reduce light from passing through by 2, 3, and 4 stops, respectively. Each filter creates a darkening of the entire image, allowing you to photograph with a wider aperture to control depth of field or a slower shutter speed to convey movement more easily. The filters are made from optical glass with waterproof and scratch-proof multi-coating, which reduces reflection and maintains clarity and color fidelity. The filter rings are made from aluminum, they have a circular shape, and the kit includes a metal case to protect and carry them.