Newtons Cradle DIY SetThis is a DIY Pendulum Wave ball, so some simple assembly work is needed before using it. After you have assembled it, you will play it with a great sense of accomplishment. Easy Assemble ToyTo make the glass balls move,just push it slowly with the supplied wooden strip, then gently loosen it. Desktop DecorationOffice Desk Decor,Show some character and express your love for science and physics with this decorating your office space. Kids Experiment ToyFor Kids Handmade, educational classy experience the visual display of momentum, use this in class and share with your friends and family the exciting world of physics and science. Quality MaterialsKids Educational Intelligence Developing Toy made of durable wood and glass, easy to assemble, after assembled it is a durable toy or decoration. Specification: Material: Wood Size:14.5cmx10cmx10cm/5.71inchx3.94inchx3.94inch Package Includes: 1Newton's Cradle DIY Set