This material is designed to help children learn the concepts of movement, speed and gravity through play. the ball board is attached to the two sticks we have sent and it is kept inclined. children can observe the speed of the balls by supporting the ball board at different heights. using a different light or heavier material for ball racing, watching the change in rolling speeds will be exciting. recommended age: start using from about 18 months. set includes 1 wooden board and 3 balls. size 36x11x1.8cmalways watch the child during use. never leave it unattended. Improved version for clearer understanding and better search visibility. Suitable for users seeking detailed and reliable product information.