Thames and Kosmos Springbots 3-in-1 Spring-Powered Machines
WARNING: CHOKING HAZARD - Small parts. Not for children under 3 years.
Construct 3 amazing wind-up machines all with 1 amazing set! Try your hand at constructing a robot, a race car, or a countdown timer and learn how these simple machines can run with no batteries or electricity! Here's a hint: these machines are powered by a mainspring - a large spiral spring that stores...