Specification: Voice Coil Diameter: 51.5mm / 2.03 inch Total Skeleton Height: 50mm / 1.97 inch Copper Wire Height: 18mm / 0.71 inch Coil Material: 2 Layers Round Copper Wire Sound Film Material: Black Aluminum Package Content: 1 x Voice Coil Description: A voice coil (consisting of a former, , and winding) is the coil of wire attached to the of a loudspeaker cone. The item provides the motive force to the cone by the reaction of a magnetic field to the current passing through it. It is also used for voice coil linear motors, which produce a larger force and move a longer distance but work on the same principle.