Tape binding, post binding, and velo binding are often used for presentations. In the first case, the covers and book pages are taped together over the binding edge. In post binding, screws are used in much the same way as side stitching (but the books can be disassembled and pages can be added or removed). In velo binding, a thin, flat piece of plastic runs the length of the bind edge on the front and back of the book, and thin plastic pegs attach the two through the pages of the book.