Featuring with the function of antianxiety, the toy can be used for stress relief and making relaxation in office or home. They collided with sounds effect, rotating at high speed, very interesting.You can grab the middle of the connecting rope betn two balls and swing it up and down until the two balls fight and make a sound of tech, tick or knock. It is a favorite toy for children, especially primary school students.It is constructed of ABS material.4cm,The diameter of each sticker is 4cmcm. 3cm,The diameter of each sticker is 3cmcm. Perfect for children, teenager, home use, etc.Item Name: Ball ToyMaterial: ABSColor: Random ColorFeatures: Pocket-sized, Colorful, Smooth EdgeWith Light Battery: Built-in Button BatterySize Details:4cm, Diameter: 4cmcm/1.57"(Approx.)3cm, Diameter: 3cmcm/1.18"(Approx.)Notes:Due to the light and screen setting difference, the item's color may be ightly different from the pictures.Please allow ight dimension difference due to different manual measurement.Package Includes:1 x Rope1 x Grip2 x Balls