Formatt Hitech 150x170mm (6"x6.69") Neutral Density Soft Edge Grad 0.6 (2 Stops) for Lee SW 150 Holder Systems compatible with all 150mm holder systems 2 stop (0.6) Soft Edge graduated ND filter Soft edge filter has seamless transition at middle of filter and ideal for all landscape and horizon work Made in the UK in rugged and durable CR39 resin Compatible with Lee SW150 and all other 150mm systems