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Those wound with the #12 enameled solid conductor do not take power with my
ant/feedline impedances resulting in discharges between bifilar pairs (not
between individual bifilar windings). Also, the green wire of unknown
insulation does not take power. So, those CMCs wound with solid conductor
are coming apart and being rewound in some fashion or another with the
DavisRF "antenna" wire which seems to take power to at least 1.2 kW. Your
mileage may vary with different impedances presented to the chokes.

Those frequencies on which I tried the CMCs at power are:
3.8 MHz 24 - j56
7.15 MHz 493 - j740
Impedances noted are measured at the shack end of the parallel wire
feedline.

Dave - W?LEV

The Balun Designs bifilar-wound choke-baluns use #16 or #14 (not sure) bare wire slid into very small Teflon tubing. (I think Amidon has it).
I use the 1171, rated at 5kw and 10kv - - with T-network and ladder line.
Good pictures, graphs, and specs on that site.
73, --kv5r
PS: no connection to them, just a customer.