Ernie Ball P03818 JOHN MAYER SILVER SLINKY SIGNATURE ELECTRIC GUITAR STRINGS 3-PACK Keyboard Amp The included 9 Volt battery

The included 9 Volt battery is replaceable

or in the karaoke bar

Ultra-compact

Scale (mm)630

Ernie Ball P03818 JOHN MAYER SILVER SLINKY SIGNATURE ELECTRIC GUITAR STRINGS 3-PACK Keyboard Amp The included 9 Volt batteryErnie Ball P03818 JOHN MAYER SILVER SLINKY SIGNATURE ELECTRIC GUITAR STRINGS 3 PACK Silver Slinky Strings are the result of an extraordinary partnership between Ernie Ball and John Mayer. They feature a never before offered gauge combination along with Reinforced Plain Strings (RPS) for added tuning stability and durability. Each string has been meticulously engineered with specific gauges and core to wrap ratios to meet Johns exacting standards,