These economy tray units are supplied empty and made from 18mm MFC and delivered fully assembled. Perfect for all classrooms and offices where you would like to decide the size trays you will need. You can mix different sizes of trays within the units and they are compatible with both Gratnells and Monarch trays. Supplied with lockable castors. Comes with a 5-year manufacturer's warranty. Supplied fully assembled and made from Beech MFS. These units really are great value for money.