This mattress stopper is made of iron material, which can withstand the lasting use. Features the good iron material, which has high durability, not easy to deform. Fine workmanship, it ensures the mattress stopper practicality. Features -Color:Black -Material:Iron -Size:21.00X18.00X8.00cm/8.25X7.07X3.14in - They are strong enough, not easily deformed or broken, and can serve you for a longtime. - It can be installed around the bed frame to easily solve the problem of mattress sliding. - The mattress rack ideal for keeping your mattress in place and ensures that you won't need to adjust your bed. - Characteristic and with professional design. Simple and generous , smooth in lines. - Compatible with bed frames, spring beds and adjustable bed frames or foldable mattresses of all sizes. Package list: 2 x Iron Mattress Holder