Whose KNEX constructed car is the fastest? Put your skills and your friends to the test with the Dueling Racersª set. Build two cars at once using 136 pieces, including rods, connectors, bricks, and two motors. Once your car is complete, challenge your friends to a race. Includes instructions to build two lead models and two alternate models. Requires four AA batteries, not included.

Recommended for ages 7 and up.