Rainbow® 17 (395gsm) cover material consists of a high-strength substrate with a water-based color coating and protective acrylic top coat on the front, and white clay-coated smooth board back for good dimensional stability. Offered in a traditional selection of colors and embossings, resembling Leather or Linen, Rainbow® 17 is a beautiful yet economical choice for self-supporting books, perfect-bound books, bibles, guides, and more.