USM Haller 31 Serving Trolley is a serving trolley designed by Fritz Haller and Paul Schiser for USM. The trolley is made of five chromed metal tubes that form the frame on which the lacquered metal plates rest. USM Haller 31 Serving Trolley is available in several different colors and follows the same line as the rest of the collection.

USM Haller is based on and constructed with three basic elements: the ball, connecting tubes and panels. The system can be built in any direction, disassembled and reconfigured to meet changing requirements. The modules can be further customized by adding doors, doors and a variety of interiors for easy organization.