The Shower Filter Replacement Cartridge is a set of 4 15-stage filters designed to reduce the effects of hard water in your shower. Made from durable Acrylonitrile Butadiene Styrene (ABS) material, these white cartridges are universal in size and shape, making them suitable for use in most shower heads. Each filter is bacteria-resistant and ensures a clean and refreshing shower experience. Easy to install and lightweight at 1.7 pounds, this replacement cartridge set is a convenient and effective solution for improving the quality of your shower water.