Get a professional edge! Create easy to handle bound documents with these plastic comb bindings. Your reports and documents with have professional custom look. for use with or any standard 19-ring comb-binding system. Global Product Type: Binding Spines-Comb. Sheet Capacity: 55. Spine Diameter: 3/8". Number of Rings: 19. Color: Navy. Material: Plastic. Quantity: 100 per pack.