With the looping you turn the world upside down for a moment. Find out how much momentum your ball needs to make it through the loop. Combine the looping with the GraviTrax starter set and bring even more action to your course. You bring your bullet to the target? There are no limits to building fun. Contents: 1 action stone loop, 1 rail long, 2 rails medium, 3 rails short. Caution: Not suitable for children under 3 years due to swallowable small parts.