Polyester filters offer many advantages over the traditional gelatin filters and are priced at a substantial savings! Polyester filters will withstand the rigors of daily studio or location use for a longer life than gelatin filters. They're impervious to water and can be cleaned quite easily and safely. A 100 micron (0.1mm) polyester film offers an extremely smooth surface and a highly efficient transmission rate with no image degradation. Dye colors are fused into the filter and will retain their color value, even after extended use. All polyester filters are fully compatible with Kodak Wratten Gels.