Wood/aluminum structure SDL Aura. Wood on the inner side of the roof makes it natural and unique, aluminum covers on the outer side protect from weather. Covers are available in any RAL color; thus SDL Aura will visually match the building's design. Moreover, system has constructive advantages, such as optimal protection from weather influences or overhead heaters. As standard, SDL AURA is made of glued spruce, other types of wood on request.