​The Premium Curve 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 have great performance. Create an oval raceway, test your skills with s-turns, and more. The Premium Curve Pack is one of 7 different component packs that let kids BUILD, STUNT, and BOOST. The BUILD category enables kids to create dynamic track paths in their Track Builder world. Connects to other Hot Wheels® sets (sold separately) for infinite possibilities. Add to other packs in the STUNT and BOOST categories for even more fun or add this stunt to Multi-Lane Speed Box or Triple Loop Kit (sold separately). Great gift idea for ages 6 to 10 years old.