The LEGO Technic Monster Jam Dragon (42149) is a pull-back truck toy perfect for kids aged 7+ who love Monster Jam. Featuring fierce dragon spikes, horns and realistic graphics and colors, this 2-in-1 toy lets kids build and race their truck or rebuild it into a Crocodile Buggy model. With pull-back action, kids can race and recreate cool monster truck jumps and tricks. The LEGO Builder app also provides an easy and intuitive building adventure where kids can track their progress and save sets. LEGO Technic buildable models feature realistic movement and mechanisms, making it a great introduction to engineering for young fans. This Monster Jam toy truck model measures over 4.5 in. (12 cm) high, 7 in. (19 cm) long and 4 in. (11 cm) wide and contains 217 pieces.