HIC's Pop-Up Sponges for scratch-free cleaning of pots and pans, plates, glassware, barware, non-stick cookware, and anywhere dirt exists Made from natural vegetable cellulose; durable and reusable; compressed for compact storage and easy transport; won't scratch surfaces; set of 4 Simply add water and sponges expand to full size (4.25 x 3.25 x 1-inches); once sponge expands, it won't return to original compressed size Tough on dirt, gentle on delicate surfaces; safe for nonstick cookware; dries quickly to reduce sour odors Durable, reusable, wear-and-tear resistant; dishwasher safe for a thorough sanitizing between uses; squeeze out excess water and allow to air dry