Heebie Jeebies Construct a Clock

This kids construction set is an ingenious way to encourage your child's cognitive development as they learn how gears work. Build a clock within 10 minutes, wind it up and watch it run for over 8 hours. No batteries required! - This kids construction set is an ingenious way to encourage your child's cognitive development as they learn how gears work. Build a clock within 10 minutes, wind it up and watch it run for over 8 hours. No batteries required!