Fellowes Plastic Comb Binding Spines, 3/4 Inch Diameter, Navy, 150 Sheets, 100 Pack (52392) Versatile plastic comb binding gives a professional appearance to bound reports and presentations. Available in a variety of colors to match your covers for a custom look. Also available in a variety of sizes to bind 12-500 page documents. Use with Fellowes or any standard 19-ring comb-binding system.