Start your engines! Have tons of fun while racing cars along an exciting track with the Upside Down Overpass Speedway Motorized Cars Set by Darda. This new car racing playset with loops is even more fun, thrills, and racing action! First, your children will build any track they want with the included 2 bases, 3 straight tracks, and 8 bendable track pieces. Your race builder can build up to 4 loops with the flexible racing tracks. The included instruction manual shows 3 simple track designs that your child can create. Then, race the included Porsche Boxter model through the loops. Mega MotorG power engine that works without batteries or electricity allows your child's racing cars to speed 500-600 scale mph . This speedy wind-up car has enough energy from one wind to go through the loops 5 times! The Upside Down Overpass Speedway Motorized Cars Set from Educational Toys Planet will provide your child many hours of wild racing excitement!