Haida 150mm x 150mm ND32000 ND-4.5 15 Stop Neutral Density ND Optical Glass 150 Series ND32000 / 15 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