GHS Resonator Guitar Sets are designed and used by professional players. the gauging and materials have been selected to provide long-lasting bright tone for all playing styles. The core to wrap ratios give you brilliance, sustain and volume - a great combination to make sure you are heard, loud and clear. Excellent for RESONATOR/slide guitar. 16-18-N28-N36-N46-N56. Pure nickel roller wound strings generate brilliant tone for a LONG time! GHS has made the highest quality strings since 1964. The choice of numerous great pickers!