Material of the top removable board is superior plastic,the 5 pipes are carbon steel. This bathroom shelf organizer is adjustable,the length can be adjusted between 20.85 to 35.5 inch,the width is 11.8 inch. Space saving,easy to install,no need to drill the walls. Perfect for add extra space for kitchen cupboard,refrigerator,wardrobe,closet dresser,bookcase,bathroom vanity,shoe cabinet,etc. Installation instructions is included,and if you have any question for how to install, please feel free to contact us at any time. Adjustable Closet Shelf Organizer Bathroom Organizers and Storage,Length Extends from 20.85" to 35.45",Width 11.8" - BD7RE3L4G