The Kase KW Revolution Professional ND Set includes ND8, ND64, ND1000, CPL filters, designed with color-coded filter frames for easy identification and swapping. The ND8 is color-coded blue, the ND64 is yellow, the ND1000 is red, the CPL is silver. The kit also includes adapter rings, a filter case, and one front lens cap. The KW Revolution system is based on Kase's earlier Wolverine series and is fully backwards-compatible with Wolverine filters. KW Revolution filters are made with shock-resistant and water-resistant optical glass that's durable and easy to clean, and that doesn't cause any color cast. In addition to being magnetic, the filters are also front-threaded. This is one of the differences between the KW Revolution series and the earlier Wolverine series. This kit includes both the standard magnetic adapter and the inlaid magnetic adapter supported by the KW Revolution series. The standard one screws onto your lens and lets you magnetically attach the filter to it. But the inlaid adapter works a bit differently. It secures to your lens in a very recessed way. It screws onto the front filter threads very close to the front lens element and nearly hidden within the filter thread area. It hardly leaves any space between the lens and filter. This results in minimized vignetting with wide angle lenses when you attach the filter. The filter snaps onto the adapter magnetically. Up to four filters can be stacked in total, both from this KW Revolution series and from the earlier Wolverine series, and the filters can be freely rotated.