DURABLE SHERPA 10-Panel Desk Reference System Extension Set, Assorted Color Borders (569800) Expands SHERPA Desk System 5542 Starter Set without limits,Letter size,20 viewing sides Sleeves have rugged frames for heavy use Glare-free, environmentally-friendly polypropylene sleeves with rugged frames Frames available in gray or assorted colors (2 ea red, black, dark blue, green, yellow) Includes extension bracket, 10 sleeves and 10 snap-on tabs