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.