Using these Monster Jam trucks is easy. Just take them out of the box and start creating stunts and jumps like you've seen in the live shows. You can have face - offs between the trucks in the 2 - Pack or add more 2 - Packs to host a big event with friends. When playing, make sure to play on a clean and flat surface to avoid any damage to the trucks. To maintain your trucks, keep them away from water and sharp objects. If they get dirty, you can use a soft cloth to gently wipe them clean. These toys are for kids ages 3 and up, so adult supervision is recommended for younger kids.