Oxford Pressboard 11 x 17 Inches Report covers with Reinforced Side Hinge (13234) Letter Red Built-in Two-Prong Metal Fastener Contains 65% Total Recycled Fiber, 30% Post Consumer Fiber. CPG Compliant, SFI Certified, Acid Free. Specially sized for holding oversize documents. Heavyweight rigid Pressboard construction. Tape reinforced side hinge. Holds up to 3" of paper.