Description Features: 1.The glass ball is environmentally friendly, non-toxic and can be used for a long time 2.High-quality educational science tool that perfectly demonstrates the conservation of energy 3.Suitable for home decoration, study decoration, etc., 4.The craft can be used for gifts and children toys 5.After the battery is installed, it will light up on the base plate, and the ball will be colorful and stylish. specification:Item Type: Pendulum Ball Decoration Battery: 4 x AA Battery(not included) Optional Style: S Ball with Black Base, M Ball with Black Base S Size: Approx. 12 x 12 x 9cm / 4.7 x 4.7 x 3.5in M Size: Approx. 15 x 11.5 x 15cm / 5.9 x 4.5 x 5.9in PackageList:1 xPendulum Ball Decoration