Scrub Daddy Original 4 Pack Dish Sponge Kitchen Scrubber Scratch Free Non ToxicTemperature Controlled Scrubbing Changes texture based on water temperature becoming firm in cold water for tough scrubbing and soft in warm water for light cleaning Lab Tested Scratch Free Performance Safe to use on over a dozen different surfaces including glass stainless steel cast iron and non stick coatings Odors and Stain Resistant Specialized foam is designed to rinse clean and remain odor free for up to eight weeks with proper maintenance