The Amazing Clock Kit is the perfect set for building your own real wind-up clock! It'll be perfect for teaching kids all about the inner workings of a clock. Both sides of the wind-up clock are transparent, meaning that kids will be able to see the cogs of the clock as it works. They can watch as they each rotate and cause the pendulum to swing, as well as turn the hands of the clock and make the bell chime! Once fully wound, the clock mechanism should run for around size hours.Clock face size: 19.5cm (7.7 inches)Includes 29 clock pieces and instructionsTransparent sides to reveal the inner workings of the clockSuitable for ages five years and overPerfect for developing fine motor skills, hand-eye coordination and sequencingThe Amazing Clock Kit