This staircase is supported by a central pillar in painted steel, the grades are produced in solid wood on demand. The balustrade could be made with high- grade straps of different number or with panels of glass. The balusters of the balustrade are made of high- grade steel, the handrail could be made on demand of wood or high- grade steel. Every grade is singular, because the grades are adapted to the room- dimension and built in the materials chosen by the client.