Round spine & pen holder for user-friendly handling on the move. 82 mm spine width. 500 A4 sheet capacity (80 gsm). Inside pockets to store papers, CD & business cards. Lightweight PP polyfoam material, extremely durable, brushed steel effect cover. Attractive elastic band fastener for secure transportation of documents. Patented 180 precision mechanism for 50% wider opening & 20% faster filing. 5 year guarantee on the mechanism.