This is the F12 with paper surround.  Other F12 features foam surround.
Please allow up to 4 weeks to receive your drivers once the order is placed.  These drivers are guarenteed for life directly by Lii-Song.  
 
The price is for a pair of drivers.
 
Here are the specs.
 
Nominal impedance Z: 8Ohm
Power：40-80W
Frequency response：50-17khz
Fs: 59.4 Hz
Sd: 54.325 cm³
Qms: 15.161
Qes: 1.116
Qts: 1.040
Magnet：Y35（Ferrite）
Mean Sound Pressure Level: 95.2dB （2.83V/1m）
Weight: 11 KG
Package dimension: 42*36*36 cm
Paper Cone Material: Compound Pulp