JL Audio 10w1-4 12w1-4 15w1-4 2.015" 

Single 4 Ohm Voice Coil  

• Former Height: 1.9"  (48.3mm)
• Winding Width: 0.97"  (24.64mm) 
• Outer Diameter: 2.175"  (55.25mm)
• Inner Diameter: 2.015"  (51.18mm)
• Impedance: Single 4 Ohm
• Layers: 4
• Former Material: Kapton
• Wire Material / Type: Round Copper