The NX-Series STARTER Kit includes the new NX-Series filter-holder and a CPL filter. It also includes one square and one rectangular empty frames, in which you can fit the Nuances Extreme filters you already own. A small screwdriver is included to install the filters in their frame. The kit has also 3 adapter rings and one wallet included so you will be able to start doing pictures immediately. If you do not own some Nuances Extreme filters already, the NX-Series STARTER Kit can be a good starting point to progressively build up the NX-Series system of your choice.