Here they are. Get them while you can. This pair is from the X Line comp set: http://car.rainbow-audio.de/products...=11&art=231439
They are NOT the same as the silk VOF tweets use in the Power Line. As far as I can tell they are the same as the Cal 25 used in the older Professional line as well as the Arc Audio ACS set.
Great overall tweeter. Smooth sound with nice detail. They haven't really even had enough play time on them to be broken in yet....< 10 hours I'd say. They are basically brand new. Would love to keep them but I can only use one set of tweeters at a time
CAL 25 Fabric
Part number: 231439
Peak power handling: 150 Watt
Nominal power handling: 100 Watt
Minimum amplifier power: 75 Watt -
Input sensitivity: 90 dB 1W/1m
Frequency response: 1.800 - 23.000 Hz
Impedance: 4 Ohm
Crossover slope: 12 dB/Oct.
Crossover frequency: 3.400 Hz
Thermal protection: PTC
$125 shipped in the US