This set of two needle felted wool sponges offer a sustainable and biodegradable alternative to synthetic sponges. Use them the same way as a conventional sponge – lather, scrub, and rinse. The wool sponges will continue felting with use until they become about 3.5x3.5 inches. Air dry between uses. Because wool is antimicrobial and natural, these sponges will not get stinky or release microplastics. Place your wool sponge in your compost pile at the end of its life.