Please can you TBers with greater experience in strings help me to ID these rounds I got on a 2nd hand jazz bass.

They have these coloured ball ends and no coloured thread or silk at the tuner end of the strings.
They've got a nice rounded tone and fairly low tension which makes playing a lot easier than the high tension rotosounds on my other jazz bass.
Anyone got an ideas? I'd really like to find them so I can get the same strings on all my basses.
Cheers