Fun Central AT997, 1 Pc, Newton's Cradle Physics Science Balls Kit, Newton's Cradle, Cradle Balance Balls, Newtons Cradle Pendulum Balls, Newton Balance Balls DIMENSIONS: The Cradle Balls Kit has a dimension of 4.6 x 1.5 x 3.7 inches EDUCATIONAL: The Newton's Cradle teaches principles of physics in a fun, hands-on way. Experiment with releasing multiple balls at once and observe the effect. Pull back the polished steel ball on one end and let it fall. When it hits, it transfers its energy to the ball at the far end of the line, setting it in motion HAVE FUN: Challenge your children's imaginations and keep them active with Fun Central. The Newton's Cradle makes a fun conversation piece between you and your kid. These Newton Cradle Balls are absolutely perfect to be placed on a desktop or coffee table INCLUSION: Each package includes one kit of Newtons Cradle Physics Science Balls MATERIAL: This Ball Cradle is made from high quality materials that are non-toxic and designed to last for a long time. Easy to use and absolutely amazing Newtons Cradle Balls.