Overview of the Urth ND Selects Filter Kit Plus+ (39mm) The Urth ND Selects Filter Kit Plus+ includes an ND8 Plus+ ND64 Plus+, and ND1000 Plus+ so you can elevate your landscape photography in different light conditions. By blocking 3 (ND8 Plus+), 6 (ND64 Plus+), or 10 (ND1000 Plus+) f-stops of light, the filter kit gives you the creative freedom to explore long exposure and depth of field effects no matter the light conditions. The Plus+ range features 20-layers of nano-coating, which provides easier cleaning and better protection against water, oil, and scratches. These layers also provide a higher maximum light transmission and a more consistent transmission curve for sharper images, finer colors, and greater depth. Features of the Urth ND Selects Filter Kit Plus+ (39mm) Double-Threaded for Stacking Filters B270 Schott Optical Glass Ultra-Slim Magnalium Rim 20 Layers of Nano-Coating For more Urth Products see here.