The "Extra Thick Mattress Slide Stopper" is a set of 6 retainer bars designed to prevent your mattress from sliding off your bed frame. Made of durable metal and featuring a black color, this product is easy to install with the included components and installation manual. With a rectangular shape and a weight of 1.23 pounds, this mattress stopper is a practical and reliable addition to your bed frame to ensure a comfortable and secure sleep.