NiSi 150 mm Square Leather Filter Case 150 mm System Square ND,GND Polarizer Filters (can Hold 6pcs Filters) Suitable Filter Size: 150X150mm, 150X170mm NiSi 150 mm Square Leather Filter box for 150 mm system square ND,GND Polarizer filters (can hold 6pcs filters ) Exquisite and durable fine workmanship Sturdy and durable Can hold 6pcs filters Suitable filter size: 150X150mm, 150X170mm