spiky ball in 65mm dia, with light & sound, yellow, blue, pink & green ... , pink & green color, other OEM color available.5. bouncing the ball which will light up and shut off acutomatically after 15 ... seconds.6. a kind of exercise ball, bouncing and press the ball to relax.7. fit for indoor & outdoor, fit ... 3 years old, popular for students and office workers. flashing spiky ball