The Sherpa Expansion Set from Durable expands the Sherpa Desk System (DBL5542) without limits. Included are 10 sleeves (20 viewing sides) per extension set. Glare-free sleeves made of environmentally friendly polypropylene have rugged frames in light gray. Also available with frames in assorted colors - two each in black red dark blue green and yellow (DBL5698-00). Includes extension module 10 Sleeves and 10 snap-on tabs.