Give your pet the mental stimulation it needs with our Rolly running wheel . Attach the Rolly wheel to your cage or to the Savic Rolly metal stand ( Art . No . 4026 ) . A running wheel helps your pets burn energy , utilizing their natural instinct to run . Our Rolly wheel has a closed tread and back wall that provides safety and protection . We recommend you check your running wheel regularly for signs of nibbling and other damage , to prevent injury to your pet . To ensure the wheel keeps turning easily we recommend occasional treatment with cooking oil .