Using the Avengers Hulk Gamma Smash Fists is easy. Just put the fists on your hands with the grip bands inside to keep them secure. You can then start your pretend battles and smashing like the great Hulk. When using, make sure to play in a safe area to avoid any accidental knocks. Also, don't pull or tug too hard on the fists to prevent damage. To maintain them, simply wipe them with a clean, damp cloth if they get dirty. Keep them in a dry place when not in use. These fists are designed for kids aged 5 and up, so make sure younger children don't use them unsupervised.