GBC Spiral Bind Combs are also known as Plastic Loop Bind, GBC binders, 19 Ring Combs, Comb Book Binders, Plastic Cook Book binds, Ibico Spiral binds, Plastic Book Spines & GBC Spines. The GBC Comb bind is a plastic tube with comb-like fingers that fit into rectangular punched holes. Books bound with plastic GBC combs will lay flat, fold back and rotate full 360 degrees. Spiral GBC Combs will not chip, scratch, peel or discolor.The GBC Spiral comb book binds come in standard colors and their low cost makes GBC comb binding the most economical way to bind books.