Thomastik 4 Bass Strings JR 344 43-89 Nickel Round Wound

These strings are not for everyone, they are very unique in their sound and feel.
They sound quite warm but very growly with good mid range presence. They're definitely not very sparkly on the high end.
Now the feel. They are like no other strings. Very supple feeling, the E string is extremely thin. You have to play quite softly in order to accommodate for the loose tension and feel. If you can manage, these stirngs feel like cheating, they're so easy to play. These are definitely more biased to fingerstyle playing.

Good service.

I use jazz flats and jazz rounds on all my basses. They cost more than most strings but they can't be beaten for playability. The rounds are a lot brighter - maybe a bit too low tension if slap is your thing but a good all round string. The flats have a great jazz sound and are much easier to play than most other flats.