Cerlox & Comb binding is the most common binding style used in North America and has been around for more than 40 years, is simple and readily available. Plastic comb binding books have the ability to open flat for easy copying and can be easily opened and closed with a comb binding machine for editing purposes. Plastic comb bindings are available in several colors and in sizes up to 2”. Comb binding is the most economical outside of Saddle Stitching. Pros: inexpensive step up from saddle stitching. Cons: not as sturdy as coil or twin loop wire binding and if your presentation is for repeated use, may not hold up long term because the teeth break off.