These sponges are both fun and functional – each comes packaged in a thin, cellophane sleeve and is completely flat. Once placed under water, the sponge expands and becomes useful. Sponges are crafted from cellulose, a plant-based material that is biodegradable and eco-friendly. Designs include bold color and humor-filled sentiments, making everyday chores just a bit more enjoyable. Product lifespan is 1-2 months.