The Ernie Ball John Mayer Silver Slinky nickel-wound electric guitar strings are meticulously engineered in partnership with legendary guitarist John Mayer. Featuring a never-before-offered gauge combination (10.5, 13.5, 17.5, 27, 37, 47) and custom Slinky recipes specified uniquely to John's preferences, these strings deliver unmatched performance and playability. Reinforced Plain Strings (RPS) add tuning stability and durability, ensuring these strings stand up to demanding performances and studio sessions. Experience the difference handcrafted, customized strings can make to your tone and playing experience.