Call it what you like, a bungie, a twister, a boing or a swing; the fact is that birds love the natural movement. The length and width of the coil are adjustable. Suggested for Cockatiels, Quakers, Ring necks, Lories, small Conures Etc. Spiral Is Adjustable, Bounces and Sways, Intended For Tiels, Conures, Caciques Lories and Similar Size Birds.