Poly binders are one of the strongest, most durable types of binders because they are constructed of a single sheet of poly. Poly is flexible, lightweight, and economical. Additionally, poly binders are long lasting because they resist dirt, grease, and water. These binders are available in various gauges, colors, or finishes - smooth, lined, matte, glossy. They can even have clear overlays for your printed sheets! They can be printed one-color through four color process (4CP).