Jantzen C-Coils are Toridal cored coils of high power rating and extremely low DCR. These coils are heavy !
In his book 'High Performance Loudspeakers', Martin Colloms praises the virtues of Toroids including low distortion and self screening of stray magnetic fields.
Note the inductance value needs to be measured at 100Hz - The range where they are typically used as an inductor for the bass driver.
Typical handheld LCR meters measure at 1,000 Hz and will read a lower value than labelled. This is not a fault.
They should be used in Bass crossovers only due to core distortion at higher frequencies.
Limited stock kept locally but available by special order in a range of 0.41mH to 38mH.
Tolerence of 5%
Sorted by value then gauge.