The iSpring 3 Stage Reverse Osmosis Water Filtration System Head is a white water filter unit made of plastic and metal. It features a 3-stage filtration method using reverse osmosis technology to provide clean and purified water. This unit does not come with canisters and is designed to be installed as a standalone system for home or office use. With its compact design and easy installation, the iSpring filtration system is a convenient and effective solution for improving your water quality.