Accessory business card and CD panels are compatible with all Durable Sherpa and Standard display reference systems. Business Card Panels hold 20 business cards per panel. CD Panels hold four CDs and four indexes per panels (blank indexes included). Keeps cards, CDs and DVDs with reference documents. CD pockets have a protective inner cloth liner. Rugged outer frames withstand wear and tear. Panels are made of heavy-gauge nonglare polypropylene and offer rigid outer borders. Includes snap-on tabs.