Using this servo horn set is easy. First, make sure you have a 9 - gram micro - servo. Just snap the horns onto the rotating part of the servo. When you're working on your robotics project, you can drill or glue the horns to your armatures as needed. Remember, these horns are only for 9 - gram micro - servos, so don't try to use them with other types. For maintenance, keep the horns clean and dry. If they get dirty, you can gently wipe them with a soft cloth. Avoid dropping or hitting the horns hard, as this could damage them and affect their performance.