Send the ball through the loop! With the loop, you turn the world upside down for a short moment. Combine the loop with the GraviTrax® starter set and get even more action on your courses. How much speed does the ball need to reach around the loop? Contents 6 parts: 1 Guide, 1 action-stone loop, 4 large height modules. Can only be used with the GraviTrax® starter kit. From 8 years.