GHS Precision Flats
I had been wanting to try these for a long time. To me they are THE flatwound string sound, but I'm going to go back to chromes for a better 'do everything' string.
These have been only strung once on a 4 in a row P bass and have plenty of wraps. Note - they were strung thru the body so they will have a crease if you go through bridge
Fender Precision Bass Club #858
Black 'n' Maple Club #445
Pennsylvania Bassists Club #107