The Premium Curves Set is part of the Building category. With the 90-degree premium curve pieces and straight track pieces that are 30 cm and 15 cm long, children can create unique tracks. These premium tracks not only look great, but they also provide ultimate racing action. They can be used to design oval racetracks, daring S-curves, and much more. The Premium Curves Set is one of seven different component sets that allow children to build, accelerate, and perform stunts. In the Building category, kids can create dynamic racetracks for their Track Builder world. It can be combined with other Hot Wheels sets (sold separately) for endless play possibilities. Additional sets can be added in the Stunts and Acceleration categories for even more racing action; for example, this stunt can be complemented with the Multi-Lane Speed Box or the Triple Loop Kit (sold separately). A great gift idea for children aged 6 to 10 years.