K2's versatility sets it apart from other filter systems on the market, as it allows for the use of optional filters such as Gradient, Mist, Steak, and Straight ND filters, all within the same system. In the box: Master Base, VND1-5/CPL, VND6-9/ND32-CPL, VND Base, Adaptor Ring (67mm, 72mm, 77mm, and 82mm), Back Cap, Lens Cap to be installed on top of 1-5 or 6-9, Filter Case. Bonus: Snow Mist 1/2 Filter + Gold Steak Filter + Reverse GNDO. 9 Filter Only used for review. Like new condition! Overall Value $778.00 Selling for $475.00