Boys at the age of two to five are always curious to know how things work and how they are constructed, so we have created a toy that allows them to explore both the mechanism of the toy and its function. Because STEM DIY series toys allow kids to create their own toys and increase imagination and thinking power, these DIY toys provide a great way for them to play and learn. Having trouble finding a good toy for your 2, 3, or 4,5-year-old kid? Here's one that's durable and will last for years to come.