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A spiral bound coloring book format refers to a coloring book that is bound using a spiral wire or plastic coil, which is threaded through pre-punched holes along the edge of the book's pages. The cover of a spiral-bound coloring book can be either hard or soft, depending on the overall design and quality of the book. The cover material can vary from a thick cardstock to a laminated paper or even plastic for added durability. Spiral bound colouring books can be used by right hand or left handed people.