The Track Builder Pack is part of the BUILD category and helps kids create unique tracks with premium 90-degree curved track pieces as well as 12-inch and 6-inch straight track. These premium tracks look awesome and perform great. Create an oval raceway, test your skills with turns and more. The Curve Premium Pack is one of 7 different component packs that allow kids to build, do tricks, and power up. The BUILD category allows kids to create dynamic track routes in their Track Builder world. Connects to other Hot Wheels playsets (sold separately) for endless possibilities. Add to other packs in the STUNT and BOOST 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 6-10.