Neutral density can be adjusted from ND2 to ND400, and it is easy to create different neutral density by rotating the .

Features:
Neutral density can be adjusted from ND2 to ND400, and it is easy to create different neutral density by rotating the .
Apply slow shutter under strong sunlight exposure.
Large aperture is available to create depth of field easily.
Suitable for dynamic screen, waterfalls, streams, waves, etc.
Index marks on the of filter for exact adjustment.
Variable Filter is suitable for day- while your is set in high Aperture and low shutter to create special effect. 
1) -2: Being able to lower 1 level aperture and 50% quantity.
2) -4: Being able to lower 2 levels aperture and 75% quantity.
3) -8: Being able to lower 3 levels aperture and 87.5% quantity.
4) -400: Being able to lower 9 levels aperture and quantity, perfectly suitable for sun- with long-exposure.
(Note: The above neutral density levels are just some normal examples for reference, the real Scale is stepless and gradual.)
Compatibility:
Compatible with 72mm size lens.

Specifications:
Color: Black
Rotating: Yes
Neutral density grade: 2 - 400
Material: Optical resin glass
Filter thread size (attach to lens): 72mm
Item weight: 42g / 1.49oz
Package size: 9 * 10.5 * 1.5cm / 3.5 * 4.1 * 0.6in
Package weight: 95g / 3.4oz

Package list:
1 * Filter