“Modular Sign Systems” are available in three basic structural styles: a “one-sided 2/90 Thin,” a “two-sided System 2/90 Standard” and a “two-sided Box Rail” design, used for heavy-duty interior applications. Also offered are frame, freestanding, quick-change, window, insert and directory signs in a range of colors and finishes. (800-777-4310; fax: 616-949-5959; Internet: www.system290.com)