KMPN-1046, Medium Pure Nickel Electric Gauge .010, .013, .017, .026, .036, .046. RNB from the 1950's defined an unforgettable era in Rock N Roll history. Pure Nickel electric strings are the most popular choice for playing these classic riffs and solos. Kerly 50's Nickel are tightly wound using the finest metals, then tempered by a patented process. The strings expand and contract between Minus 320F and Plus 350F for 24-36 hours which enhances feel, tone and durability.