Formatt Hitech 150x170mm (6"x6.69") Resin Neutral Density Hard Edge Grad 0.6 (2 Stops) for Lee SW 150 Holder Systems compatible with all 150mm holder systems 2 stop (0.6) hard edge graduated ND filter Hard edge filter ideal for longer lenses Made in the UK in rugged and durable CR39 resin Compatible with Lee SW150 and all other 150mm systems