Waterproof, Stainless Steel, Carbon Steel Material: The kitchen towel rack is made of stainless steel. The outside is coated with waterproof safety paint. Of course, the material is safe, non-toxic and BPA free. NOTE: Be careful not to overload the paper towel holder. Be sure to install it on a smooth object, and make sure there is no dust on the surface of the object before installation. Multiple installation options: vertical or horizontal (left or right), the paper towel holder is ideal for mounting under the sink or on the side of a cabinet (on the cabinet door, under the cabinet), a perfect accessory to replace the countertop bracket, and a perfect space saver on the work surface. Installation Tips: If there are oil drips on your kitchen walls, please remove them before installation. The weakness of the self-adhesive hook is that it may fall off more easily if the ambient temperature is too high or the surface of the object is rough. Keep away from furnaces and water heaters before installation.