Made of non-toxic material,no harm for your pets. Style C: The inner diameter of about 22-24cm/8.66-9.45 in, outer diameter about 30 cm/11.81 in. Give your pet a treat and have hours of fun watching them play. Perfect size for Parrotlets, Parakeets, Cockatiels and Lovebirds. An ideal place designed for your little friends to play and climb, easy install in the cage.