The BRITA Bottle Replacement 3 Filter Pack is designed for use with Aqua Optima Evolve and Brita Maxtra+ water filter systems. The filters are made of plastic and use a 1-stage carbon block filtration method to remove contaminants like lead, making the water safe for household use. This pack includes 3 white filters, each with a height of 4 inches, and comes with a 1-year manufacturer warranty. It is suitable for Brita and Aqua Optima water filter brands and is ideal for home use. The product is brand new and ships for free.