The 150 x 150mm Red-Diamond ND Kit from Haida is a 3-in-1 kit featuring Red-Diamond ND1.8, ND3.0, and ND4.5 filters designed for the Haida 150 Series Filter Holder. The filters are made with shock-resistant optical glass, feature round edges, and are treated with 10 layers of antireflective nano coatings and 10 scratch-resistant hydrophobic coatings.