Lying on rail placed on the gyro, gyro let slide up and down on the track. Let rolling gyro up to a certain speed, the gyro will be issued their own colorful glare. 90 degrees towards the direction of the horizontal wave wheel, when the gyro has enough speed to ground threw the gyro, the gyro will be high-speed rotation in the ground and have a colorful lighting effects. It is constructed of alloy material. The length of this product is 20cm. It is a great gift for your kids as a gift. Item Name: Magnetic Gyro Material: Alloy Battery: 3 x Button Batteries (Included) Features: Colorful, LED, Spinning Size Details: Length: 20cm/7.87"(Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Spinning Gyro 1 x Handle (Random Color)