Description: Classic Executive Desk Toy - Revolving Swing Balance Balls Perpetual Motion Desk Educational Toys Powered by 4pcs AA batteries or USB?move lightly, it would keep going on rocking around until you stop it or power off (Batteries are not included) Kids educational physics science toy?the principles of Conservation of Momentum and Energy Great artworks for home or office desktop ornaments, also birthday gift christmas gift for your children Material: Metal, Plastic Color: Silver Specification: Size??L*W*H?approx 15*10*20cm/ 5.90*3.93*7.87 inch USB Length approx 100cm/ 39.37 inch Package Includes: 1 Set Perpetual Motion Toy (Batteries are not included) Note: Due to the manual measurement, please allow 1-2mm differences in size Due to the light and screen difference, the item's color may be slightly different from the pictures. Please understand
