CHILD’S DREAM: All kids dream of being scientist, how should we help our child? Let's start from newton's cradle balance balls and give the dream to your child

30-40 SECOND: Balls to move smoothly for up to 40 seconds Can help you explain your child that physical knowledge and Newton's story, Can help your explore The mysteries of the natural sciencesn with your child toghter

BLACK WOODEN BASE: the hard wooden base can keep the smooth operation of the newton's cradle balance balls