Stainless steel wire is the base of this spiral sturdy bird toy strung with non dyed wood, acrylics and an occasional vine ball. The little birds love to swing and perch on it as well as play and take naps after a long day of chewing on all that wood! The spiral measures 12 inches long by 5 inches wide. Convo me for a choice on the bottom of acrylic dangles, bell, plastic mini pail (pictured) or spiney critter. This toy is suitable for small birds such as parakeets, lovebirds, parrotlets, and small conures or similar sized birds.