For parakeets, cockatiels and similar sized birds. Designed for a bird s well-being. Birds will enjoy perching on the swing, and the muscles in the feet and legs will be exercised and strengthened. Attach inside bird s cage. Your bird will amuse itself by perching on the swing and perhaps even by swinging it. Be sure to select a location for the swing that is out of the way of other perches and toys. Metal, Sand.