Specification:

Voice Coil Diameter: 35.5mm / 1.4 inch
Total Skeleton Height: 40mm / 1.57 inch
Copper Wire Height: 12mm / 0.47 inch
Coil Material: 2 Layers Round Copper Wire
Sound Film Material: White Aluminum
Package Content: 2pcs 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.