Steel sheet frame painted the shade of white. Storage units can be either open, or with drawers or with a patented sliding door (patent n° MI2011A000131). Open storage units are available painted in the shade of red (Ral 3003), yellow (Ral 1023) or anthracite (Ral 9004) on the inside. All storage units can be placed in a row or stacked in columns the same width or, however, not stacked at intermediate points of underlying storage unit widths. The maximum distributed load must not exceed 1,5 kg / dm2. Starting from the second level upwards, all storage units must be fastened to wall. The max allowed height of the compositions is 184 cm.