... 3.Size:19cm*16cm*18cm newton cradle newton cradle Features:1) Wooden base newton cradle Dimensions: 19*16*18cm ... white box /36 set/ctn .2)wooden base newton cradle Material: chrome iron on the sturdy frame, ... , Five iron balls3) We are specialized in producing Newton's cradle . It is a good education toy ... people like it !4)Our balance ball depend on Newton's gravitation to swing the ball each other, ...