деревянная игрушка масштаб

Materials: wood slats,triangle brackets,wood pad, threads, round wood borad tray Theory:this toy related to leverage,triangle ,and balance It will bein static if the weight given in the 2 sides of the pivot is equal ,and will be unbalance if one side is over weight the other .. The toy and installment process can help to improve the babies thinking and hands-on ability . Especially suitable for teachers to teach the kids through class .. Can be sold as single one or combined with others to form a set (usually 12 PCS)