This adjustable bookend holder is flexible and can be re-sized according to the number of books,Size 5.9''x3.9''x7.4'',the lengest retractable size 5.9''x3.9''x18.6''. The book ends support made of metal, flim but sturdy, easy to carry, will not add visuad bulk to your shelf or desk and keep your book in order. Different kinds of books or notebooks can be classified into to keep your books or desk tidy and clean,Can be use in home, school, office, and library. It has curved corners and rounded edge,it wont scratch your countertops or furniture. 100% SATISFACTION GUARANTEE:If for any reason you're not completely happy with your purchase-simply let us know and we will either replace it or refund your money .