550 AC is a registered design by the Dutch furniture designer and interior architect Dirk van Sliedregt and is produced under license by Satelliet. The 550 is also available in a rattan look and without armrests (550 SC). The seat and back are made of the plastic HDPE. The frame is made of aluminum with a coating. The 550 can be used both indoors and outdoors. A high chair, inspired by this model, has also been developed: 550 HS.