ITEM NAME:Newton Cradle Physics Pendulum Science Z-Type Wood Newton's Cradle Art In M L4T7 Newton Cradle Physics Pendulum Science Z-Type Wood Newton's Cradle Art In M L4T7 Description 1.Instruction: Use your hand to rotate the metal part of this product . 2.Power Supply: noneï ¼Ë†friction causes energy loss, it can not moving all the time ) 3.DESIGN: This product very artistic sense and beautiful on the desk,which also a educational gift for your children. Color: silver Material: stainless steel + wood Net weight:120g size: 14 *12*15CM Use Age: more than 6 years old. Package Contents:1 x Newton cradle toy.Material: stainless steel + wood. size: 14 12 15CM. Net weight:120g.