Silver Slinky strings are the result of an extraordinary partnership between Ernie Ball and John Mayer. Each string has been carefully crafted with specific gauges and core-wrapping ratios that meet John's demanding requirements, resulting in a perfect balance of tone and tension. Gauges: .0105; .0135; .0175; .027; .037; .047. A combination of gauges never offered before. Custom Slinky formulations specifically tailored to John's preferences. Reinforced Plain Strings (RPS) for added tuning stability and durability.