Formatt-Hitech 85x85mm (3.35x3.35")Resin Black Movie Mist 0.5 Hitech filters are made from the highest quality 1.5mm optical resin. the filter is also available in 100mm, 150mm and 165mm sizes. This 85mm filter is usable with Hitech 85mm holder systems or any 85mm (3.35-Inch/P Size) holder.