The LEE100 Long Exposure Kit is a square filter kit that includes the amount of light reduction filters needed for long exposure shooting. This set includes an updated LEE100 filter holder, ND filter, and half ND filter.Kit Contents:LEE100 Filter Holder: This is a 3.9 inch (100 mm) wide filter holder that is lighter and easier to use than conventional filter holders. The filter holder slot is easy to change and can also be used with a dial lock that can be fixed in 3 different positions. Compatible with existing LEE 100mm width filters and adapter rings.LEE Half ND0.6 Hard: Half ND filter with a reduction effect of ND4 equivalent (2 stoppers). The gradient borders are hard and clear so they are perfect for shooting crisp scenes such as horizons and horizontal lines.Big Stopper: High density ND filter that is ideal for long exposure shots with a reduction of ND1000 equivalent (10 stops) of light.Little Stopper: ND filter with ND64 equivalent (6 stops) of light reduction Big Stopper, Little Stopper has a blackout sponge on the back of the filter to prevent flare.Please set the Big Stopper and Little Stopper in the filter slot on the top of the lens.Accessories: Filter guide block (1 piece x 2 / 3 pieces x 2 / 2 pieces are already attached to the holder), removal tool x 1, block & tool storage pouch x 1, holder case (for half ND) x 1, metal filter case (for Big Stopper / Little Stopper) x 2.The adapter ring is sold separately. Please purchase according to your lens aperture.