The structure consists of a core made of fir listels of our direct production, glued between themselves. By request the core can also be of poplar. For both sides the core is covered with a poplar peeled veneer of 15/10 mm or 22/10 mm. By request the peeled veneer can be double on each side and it can be glued in the opposite lengthwise of the listels. For the plating of light coloured kinds of wood, the peeled veneer can be, by request, of romager?wood (rose-coloured).