4 in 1 exercise ball is a multifunctional ball that can be placed in the cage， hung in the cage， random rolling or flat seat setting. It can be used inside or outside the cage. It is the best gadget for hamster playing toy and fitness exercise.Unique spherical design， no slits， therefore the hamster's leg won't get stuck in it. Safe use， buy it and let your pet always love rat running fitness. Open the lid to let your hamster in. Cover the lid and let it enjoy scrolling experience. Name: 4 in 1 hamster rolling ballMaterial: plastic rolling ball， iron standRolling ball:Color: blueSize: diameter 12 cmStand size: 13 x 13 x 7.5 cmNote: fits for hamster exercise and play.1 Do not use on the slope， table and the place near the stairs， because dropping ball or too fast rolling will hurt the pet. 2 Please note that using time: do not use continuously for more than 30 minutes.3 Please do not move when your pet plays inside the ball. Do not use it under direct sunlight or high temperature condition. 4 Please rinse the ball thoroughly with water after usage. Package:1 x Rolling ball1 x StandPacked in color box