The firm, closed cell structure of this product provides a tight, long lasting seal against air, dust and moisture. Great for automotive and marine use to prevent rattles, squeaks and vibrations. Can be used on auto doors and trucks, marine hatches, deck lids, around air conditioners and to stabilize appliances and furniture. Durable, black sponge rubber foam. 1/4-inch by 3/4-inch by 10 feet long.