Two Airlift Pro standing desk converters by Seville Classics. Sits on regular desk or table at variable heights between 4.9inches and 16.9inches. One is 30 inches wide and one is 36 inches wide. Both are 26.4 inches deep (front to back). The 30-inch model works well with a laptop or a single monitor. The 36-inch model works well with a dual monitor setup. For individuals who work primarily with computers the need to vary from sitting to standing, like the reasons for a properly designed office chair, are well understood for both health reasons (break up sedentary consequences) and energy management (focus). Both units are black epoxy resin (quality plastic) and metal with no visible mars or defects.