Ready, set, BUILD the track dreams are made of with Hot Wheels Track Builder Unlimited. Their loop stunt just got even more epic Boost car's momentum through loops with the Loop Kicker Pack When kids are finished playing, they can collapse the loop for easy storage. The Loop Kicker Pack is one of 7 different component packs that let kids BUILD, STUNT, and BOOST. The BOOST category are accelerators that keep cars racing through tracks. Connects to other Hot Wheels sets (sold separately) for infinite possibilities. Add to other packs in the BUILD and STUNT categories for even more fun or add this stunt to the Multi-Lane Speed Box or Triple Loop Kit (sold separately). Great gift idea for ages 6 to 10 years old.