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Any steel string not properly taken care of is subject to corrosion. What you're seeing is lots of sweat, snot, beer, etc. that was never cleaned off.
This is why I'll never buy used strings!
Fender flats are grey steel, not stainless like La Bella, D'A Chromes, or other brands. So they will rust.
Fender advertises them as stainless:
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But as has been mentioned that could just be the wrap, not the core.
Edit to add: that is the 9050L and the 9050M. The ML could've been something different.
Not all "stainless steels" are created equal; they come in different formulas. Some are more resistant to corrosion than others.
Most core wires used in bass strings are carbon steel, not stainless, so they can corrode under certain conditions.
I don't think there is any difference in the basic formula among L, ML and M, the only difference being the gauges.
Well...... maybe I'll boil 'em...... or mash 'em.... or stick 'em in a stew........
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And my comment re the ML vs the others was only based on the fact that Fender doesn't currently list the ML, and I've not been around long enough to have the experience to know what they said in the past.
As someone who has spent a lot of money buying/selling kitchen knives, I've got a pretty good handle on the difference in what is called "stainless"
The two sets currently available:
9050L (light) = 45-60-80-100
9050M (medium) = 55-70-90-105
Sets previously available, but discontinued:
9050SL (super light) = 40-60-80-100
9050ML (medium-light) = 50-65-85-100
9050CL = (custom light) = 45-60-80-105
90505L (5-string, light) = 40-60-80-100-125T (taperwound)
90505M (5-string, medium) = 45-65-85-105-125T (taperwound)
The two sets currently available:
9050L (light) = 45-60-80-100
9050M (medium) = 55-70-90-105
Sets previously available, but discontinued:
9050SL (super light) = 40-60-80-100
9050ML (medium-light) = 50-65-85-100
9050CL = (custom light) = 45-60-80-105
90505L (5-string, light) = 40-60-80-100-125T (taperwound)
90505M (5-string, medium) = 45-65-85-105-125T (taperwound)
I think it's funny that the sound of these was amazing.
Fender shows 9050ML (50-100) as in stock on their web site.The two sets currently available:
9050L (light) = 45-60-80-100
9050M (medium) = 55-70-90-105
Sets previously available, but discontinued:
9050SL (super light) = 40-60-80-100
9050ML (medium-light) = 50-65-85-100
9050CL = (custom light) = 45-60-80-105
90505L (5-string, light) = 40-60-80-100-125T (taperwound)
90505M (5-string, medium) = 45-65-85-105-125T (taperwound)
Fender shows 9050ML (50-100) as in stock on their web site.
I hope they do again. 9050L good, but would like CL I think. Would also like a 5 string option.Maybe they decided to bring them back. Not surprising... They've done that with the CL set a couple of times as well.
Any steel string not properly taken care of is subject to corrosion. What you're seeing is lots of sweat, snot, beer, etc. that was never cleaned off.
This is why I'll never buy used strings!
Fender may advertise their flats as stainless, but having played them since the change, I can tell you they are not. Stainless is exactly that: it does not rust. These strings rust if not careful.Fender advertises them as stainless:
Invalid Link Removed
But as has been mentioned that could just be the wrap, not the core.
Edit to add: that is the 9050L and the 9050M. The ML could've been something different.
I look at strings like buying a meal for two at Mcdonald's. When I am done, I throw my bag(strings) in the trash. It's only 20+ bucks.
Fender may advertise their flats as stainless, but having played them since the change, I can tell you they are not. Stainless is exactly that: it does not rust. These strings rust if not careful.