5½-inch diameter light red safelight filter (the approximate equivalent to a Kodak 1A or Ilford 915 filter) to fit Kodak Model A and Model B "beehive" style safelights. These permanently pigmented plastic filters can't shatter, as can happen with glass filters. Light red 1A type filters are suitable for use with many B&W photographic papers but are also commonly used for orthochromatic graphic arts materials. Please refer to the product data sheet packed with the material you are using to determine the recommended safelight filter.
NOTE: No safelight filter is 100% safe for an indefinite period! Always perform a safelight test with the materials you're using to determine the maximum exposure before fogging begins to occur. For information on how to conduct safelight testing, click here.