Features: 1.Suitable for home accessories, study decoration, etc., also suitable for gifts and children's toys. 2.A quality educational science gadget that perfectly demonstrates the law of conservation. 3.After the battery is installed, it will light up on the substrate, and the ball will be colorful and stylish. 4.Glass sphere, environmentally friendly, non-toxic, can be used for a long time. 5.It is a very funny decompression toy that a ball can be used to hit other balls and swing. specification:Item Type: Balanced Balls Toy Optional Size: S, M S: Approx. 12 x 12 x 9cm / 4.7 x 4.7 x 3.5in M: Approx. 15 x 15 x 11.5cm / 5.9 x 5.9 x 4.5in Color: Fuchsia Battery: 4 x AA batteries (battery not included) PackageList:1 X Balanced Balls Toy NoteDue to manual measurement, there is a slight error, thank you for your understanding.