The Speed Breaker action stone brings another slowing down element to the GraviTrax marble run world. The Speed Breaker picks up the ball, throws it down and sets it down - no matter how fast the ball rolls towards the action stone, each ball rolls out at the same speed when it reaches the bottom. In this way, levels of different heights are connected in a new and very practical way. At which points in the ball track does it make sense to brake the ball a little? In the Speed Breaker, the ball overcomes a height difference of 3.5 stones. With GraviTrax, building fun has no fun. The GraviTrax ball track system can be expanded infinitely with extensions, which guarantees limitless building and playing fun. By freely designing the ball tracks and exploring the rolling and flight behavior of the balls, the understanding of science is enhanced and gravity can be experienced up close. The STEM mark on our products signals a game category where science is experienced through play. STEM (Science, Technology, Engineering, Mathematics) corresponds to the German MINT (mathematics, computer science, natural sciences, technology).