The core AND plain strings.
http://www.ernieball.com/products/electric-strings/5386/m-steel-regular-slinky said:M-Steel, short for Maraging Steel, is a superalloy used in high stress applications for the aerospace and defense industries. The wound strings are comprised of a patented Super Cobalt alloy wrapped around a Maraging steel hex core wire, producing a richer and fuller tone with powerful low end response. M-Steel plain strings are comprised of a specially tempered steel for maximum fatigue resistance. A patented winding of steel around the ball end of the plain strings reduces slippage, breakage and stays in tune better than conventional plain strings.
Hi,
Thanks for you perseverance in innovation.
Would you have some answer to my questions in posts #22 & #23 ?
Respectfully,
FreeBird.
I just received my jp6 last week and the shop got a few packs of m steels! I left with the first set out of the shop as a thank you! The will get on the guitar this week!
Any one want me to come back with a review?
Hey savemenow,
great question! The M-Steel and Cobalt Slinkys are both great candidates for players with nickel allergies. There is ZERO NICKEL in Cobalt Slinky strings and the only nickel in M-Steels is in the core wire on the wound strings, so you won't have any problems. The outside of the wound strings is iron and cobalt - no nickel at all. The plain strings are also nickel free. Stainless will still stick around for those that prefer stainless.
I would definitely recommend checking out the new M-Steels. You shouldn't have any problems.