These Electric Stove Burner Covers can keep your stovetop clean and safe! It comes with four pieces of stainless burner covers! In each package, there are two covers that are 17 cm in diameter and two more that are 21 cm. They are also of stainless steel material which is not only durable but also safe because they are non-flammable. Simply place them on top of the burners when they are not in use.