A favorite among estheticians, these sponges are not only a great value, but they make the most out of any storage space. Made in the USA. Fully biodegradable and compostable. Completely submerge sponge under warm water to fully expand before use. Measurements: 3" x 3/8" thick All of the sponges that this manufacturer provides are made from raw materials. These sponges are made from natural, untreated cellulose fiber. While cellulose is derived from wood products, it is the most eco-friendly choice available. Sea sponges are also natural, but there is some question as to the sustainability of the world's sponge fisheries. - Natural Product, Compostable, Biodegradable