Experience the power of gravity! Gravitrax interactive track system. With the multiple expansion sets, the infinite building fun becomes more and more exciting and interesting. More possibilities - more fun. Make your balls loop the loop! With the looping section you can turn the world upside down for a moment! How much power does your ball need to loop the loop. What's in the box Instructions 1 loop section 1 long track 2 medium tracks 3 short tracks