550 is a registered design by the Dutch furniture designer and interior architect Dirk van Sliedregt and is produced under license by Satelliet. The 550 SC is available in black a rattan look and also with armrests (550 AC). 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. This model is also available as a bar chair - under the name 550 HS - in black or rattan look. Optionally, the chair can be supplied with a separate seat cushion in a fabric of your choice.