Most sponges are made with a mix of materials including plastics that are destined for the landfill. These fully compostable cellulose pop-up sponges work hard and are good for the planet! Plus, they are gentle enough for delicate surfaces. Sold individually or as a 4-pack tied together with compostable string. Dimensions are 4'' x 3'' and made in the USA. Sponge will expand quickly to full size when submerged in water.