The product is a used ProMaster 55mm Spectrum 7 1A Skylight Filter, designed for digital cameras, film cameras, and other camera types. Made in Japan, this circular filter features a clear color and a threaded mount fitting for easy attachment. With a 55mm diameter, this filter provides a skylight effect to enhance image quality and improve contrast for a more balanced and natural look in photography. Perfect for photographers looking to achieve a specific filter effect on their images.