Set of 7 - Black Standard Book Sox Stretchable Fabric Book Covers -New, Sealed Order includes 7 Book Sock Stretchable Fabric Book Covers - Solid Black color. New - Factory Sealed SUPER EASY TO INSTALL - WITHOUT RUINING TEXTBOOKS. Simply stretch our book protectors over the cover of your hardback book, and you're ready to take on the school year! No taping or gluing required - so you can reuse it year after year.