Haida 150mm ND64 Neutral Density ND 1.8 64x Optical Glass Filter 6 Stop 150 Series ND64 / 6 f Stops Compatible with Haida 150 Holders & Lee SW150 Filter Holder Dimensions: 150mm x 150mm, 5.9" x 5.9" . Made of high quality optical glass Includes 2 Foam Light Seal Gaskets Includes Metal Tin / Case