Neewer ND1000 Neutral Density Filter 10-STOP Reduction in Exposure MRC ND with Filter Pouch for Running Water, River, Cloud, Sun - AliExpress
Amazon.com : Cokin Expert ND Creative Kit - Includes L (Z) Series Filter Holder, 2-Stop ND (153), Gnd 2-Stop (121M), Gnd 3-Stop Hard (121), 4 Adaptor Rings -67mm, 72mm, 77mm, 82mm : Electronics
Amazon.com : Cokin Square Filter Full ND Creative Kit - Includes ND2 (1-Stop), ND4 (2-Stop), ND8 (3-Stop) for L (Z) Series Holder - 100mm X 100mm : Electronics