My World Build Your Own Clock Build your very own clock with this awesome interactive model that will teach kids exactly how a clock works complete with springs and cogs, you won’t need batteries either! This brilliant set comes with everything you’ll need to construct your clock including a spring, cogs, a pendulum and bell! The packaging even has fun little facts about how it all works! This fun set is the perfect educational tool to get your children learning and interested in how things work. It makes a great birthday or Christmas gift. Warning: Choking Hazard. Small Parts. Not suitable for young children.