Well, weedwackers are indeed nylon, some have a kevlar core, too.
However, there are string manufacturers who use braided nylon filaments for the core of a string and wrap steel or nylon around the core. Sometimes they're referred to as synthetic cores. Then there's nylon tape-wound on a metal core, such as what Ron Carter uses – LaBella black nylon tape-wound strings.
There's a wealth of info about various strings on
Gollihur's FAQ page, and browse each string they sell as well — there's lots of descriptions about what each type of string is like and recommended uses.
There's even more info here on TB and Double Bass Chat (used to be Rockabilly Bass), and DBC has maintained the archives of string discussions. I read up a ton on strings and decided I wanted:
- gut-like tone without gut tuning issues (I live in a hot/humid environment with heavily air-con'd indoor environs);
- versatility — prioritising slap, pizz, arco — in that order
- something to cover all the different genres of music I like
...
** Had to take a break from TB before I could hit "Post Reply"... now 8 hours later I find I've lost my train of thought. And I see SevenYearsDown has pitched in with some first-hand experience with wackers. Hey, you're both NY Staters!
Anyway, my experience is with synthetic cores wrapped in metal, FWIW. And because I wanted some arco capability it really narrowed down my choices. I picked Obligato solos and later Evah Pirazzi solos when they became available – Pirastro wasn't making Evahs when I first chose Obligato, and by the time they were, I'd broken a few Obligatos. The Evahs have turned out to be more robust than the Obs, haven't broken any Evah. I still like the Obs, but the Evahs also bow a little better.
A note on Solo sets: Solo strings are meant to be tuned a step higher low-to-high: F#, B, E, A; but I read somewhere that they can be tuned down to regular pitch – EADG – for lower tension and thus easier slapping.
Trying different strings to find out what suits you, and what your bass responds well to, can be fun, but I decided I didn't want to go down the expensive rabbit hole of trying strings, so I did my research, made my choice(s) and have been happy with my decision and strings. Nonetheless, I got a good deal on a semi-solid and wound up trying LaBella Supernils because my strings of choice weren't available immediately. It took a while to get used to the Supernils as they are extremely different to the Evahs and Obs which are alike. My next bass came with orchestral strings on it, orchestral ≠ fun. Too much tension, not good for slapping nor pizzicato. So I've had 6 types of strings total:
- Rusty crusty no-name steels that got ditched straight away
- Obligato solos
- Evah Pirazzi solos
- Another mystery steel no-name POS set
- Supernil
- Helicore Orchestral set
Other strings I looked at getting: Eurosonics/[Invalid or Expired Link Removed], Rotosound, Innovation Silver Slaps, Velvet... a few others I can't remember at the moment.
"New" strings on the market to check out: Zyex, D'Orazio Psychobilly & Rockabilly sets, Black Diamond Dog House.
Sorry for the long post, I hope it helps.
Good luck in your string quest.