Grass Metro Elite Grass America offers the new Metro Elite Undermount Concealed Drawer Slide. It features a fully concealed undermount carriage roller system that offers full extension capabilities for full drawer access. Innovations of the Metro system include the new Airmatic Shock Absorber System, a sophisticated cushioning system. The Metro Elite is available in a full range of lengths and has a 100-pound weight capacity. It is designed for frameless cabinet construction and frame cabinet construction with the addition of rear brackets.