The Outside Winding Type Voice Coil
2Layers With High Grade Copper Wire
4'' Size Coil Inside Diameter is 99.3mm
The Bobbin Material is BLACK ALUMINIUM, shorted for BASV
The Taping Paper is TKB Cloth
with Vent Holes
Widely Applied in High Power Loudspeaker, such as Woofer and Subwoofer.