From Manufacturer
This versatile Magnetic Variable ND Filter System from Freewell includes a 77mm magnetic base ring and several magnetic filters that attach to the base. You get a variable ND2 to ND5 filter and variable ND6 to ND9 filter. Then there are the mist editions of these, the variable ND2 to ND5 and variable ND6 to ND9 mist filters.
You also get a 1/8-grade glow mist filter, which softens lens flare and provides light diffusion over the entire image area, reducing saturation for a softer, more pastel effect. The bundle additionally includes an ND32/CPL filter, a standard CPL filter, a lens cap (also magnetic), a microfiber cleaning cloth, and a protective case. The filters feature multicoated glass optics and magnetic metal frames.