C-Line, Side-Loading Sheet Protectors with black paper back-backing for 3-ring binder, 3-hole punched., Open On 3 Sides, Letter, Fold-over on binding edge. · Archival quality protection. · Open on three sides. ·Paper Black mounting sheets. Fold over on binding edge for reinforcement and securing of contents. Archival quality protection means no photocopy transfer. Open on three sides for optimum versatility. Black mounting sheets provide a stark contrast for inserts. Insert Size: 11 x 8 1/2.