The AQluming Interactive Cat Toy with Track Ball is a great way to get your cat active and entertained. With a circular orbit and moving balls, this toy provides plenty of fun for your cat. The double-layered colorful butterfly is attached to the end of a fine wire that vibrates slightly, causing it to move in a life-like way. You could also change the speed and trajectory of the butterfly by changing the curvature of the wire. The AQluming Interactive Cat Toy with Track Ball is made of ultra-strong material without any odor, 100% safe and healthy for for all family members including pets.