Description * 2-in-1: A Bulldozer and Tractor in One Book! With 54 large and small parts, kids use a driver and wrench to twist and tighten pieces together to build a bulldozer — and then use the same parts to build a tractor too! This 2-in-1 design lets children carefully assemble each piece to build focus and concentration, while also encouraging creativity as they try building something new on their own. * Learn About Working Vehicles Through the Storybook "Bulldozer Is the Best" tells the story of a strong little bulldozer who helps an excavator and a dump truck at a construction site. Wherever help is needed, the bulldozer rushes over, swinging its big shovel back and forth to get the job done. Through this charming story, children naturally learn about the roles and features of different working vehicles. * Enjoy Imaginative Role-Play With Your Own Car What kinds of things happen at a busy construction site full of heavy machinery? Kids can become the bulldozer, raising and lowering the shovel to push dirt around, or become the tractor, lending a hand wherever it's needed. They can even try building a brand-new vehicle of their own! Playing pretend with the car they built helps spark curiosity and imagination. * Easy to Build With Video Guides The "Bulldozer Is the Best" storybook includes instructions for building both the bulldozer and the tractor. If building the bulldozer seems tricky, simply scan the QR code inside the book to watch a step-by-step video guide. With clear, friendly instructions, kids can build their own vehicle in no time. * Look for the KC Safety Certification Mark This product has passed Korea's official children's product safety inspection and is safe for use by children ages 3 and up.