Children who love Monster Jam have lots to discover with this LEGO Technic Monster Jam Dragon (42149) 2in1 pull-back truck toys for kids age 7 plus years old. This toy truck model lets kids recreate favorite scenes from the Monster Jam arena. It’s time for kids to put their skills to the test with this LEGO Technic 2-in-1 Monster Jam set. First they build the monster truck toy with its fierce dragon spikes, horns and fiery details.