Coil bound books convey the idea of usefulness.  From their lay flat ability, to being able to fold over itself, coil bound books are used for many purposes.  Sentinel is able to produce a variety of sizes of books that fit a wide selection of coil colors and also coil types – plastic and metal.  Coils are most often found in cookbooks, school agendas, and day planners, to name a few.  If your printed piece is designed for flexible use, consider the utilization of plastic or metal coils.