Silicone insulating pad, made of 100% food grade silica gel, approved by FDA. Non-toxic and environmentally friendly; high quality silicon material guarantees no absorption of odors, molds, stains, rust, cracks or debris. Dimensions 6.5 inches; extreme temperatures ranging from - 40 F to 482 F; easy to clean and store: just wash by hand or throw into the dishwasher when needed; sheet design is easy to cover, easy to hang and store when not in use.