Easy to Classify.The adjustable bookend have 3 grids together,so different kinds of books or notebooks can be classified into different grid to keep your books or desk tidy and clean.Adjustable.This desk storage organizer is flexible and can be re-sized according to the number of books.Good lifespan.The book ends for office is made of high-quality ABS,it is very strong and not easily deformed.Widely application.Desk bookshelf can use to magazines,encyclopedias, books,hardbacks,comic books,family albums,and more.Warm note.In order to better use the bookends,you would be better to place the bookends close to the wall and do not stretch the bookends to the longest.Scene: Office, Study, School, Library, And any other place you need to organizeModel: RetractableAnnex: Pen holderBookshelf size:Height: about 7.5in / 19cmThe Maximum Length: about 19.3in / 49 cmThe Shrink length: about 8.5in / 21.5 cmPen holder size:about 3.15x4.33inches / 8x11cmColour: grayMaterial: ABS, PP, non-marking stickersPackage Contents:1 * Expandable Bookend (with gray pen holder)Only the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.