Most sponges are made with a mix of materials including plastics that are destined for the landfill. These Cellulose Pop-Up Sponges are compostable—even in your backyard! Plus, they’re gentle enough for delicate surfaces or for use on pets. Sold individually or as a 4-pack tied together with compostable string. Dimensions are 4" L x .75" H x 3" W. Made in the USA. Sponge will expand quickly to full size with water.