Technically, the cone-shaped portion of a speaker driver, though the term may be used to refer to the entire assembly containing the cone, surround, and other driver components. The cone of a speaker is commonly made from paper, though various models have featured cones constructed of composite or laminated materials (including glass fiber), plastic, aluminum, polypropelene, or other materials. The cone attaches to the driver’s voice coil, and moves when the voice coil responds to audio waveforms. The cone physically moves the air, creating sound waves. The stiffness and damping characteristics of the cone largely determine the accuracy of the sound waves that are produced by the driver.