If you bought a servo from us you probably got a bunch of plastic add-ons that you can snap onto the rotating part of the servo. These are called 'servo horns'. For many robotics projects you'll end up drilling or gluing to the horns to attach it to your armatures. But maybe you messed up, or you want to recycle the expensive motor part? This product comes with just the horns! No servo is included, so you can reuse the motors you've got.