If you favour a much beefier, thicker low-end, the Mondo Slinky Strings tick the box. There’s only a minimal difference between the tension on the plain strings too. Here’s What Ernie Ball Say About the Slinky Guitar Strings: Ernie Ball welcomes four additional gauge combinations to its world-famous Slinky line of electric guitars strings. Turbo, Mondo, Skinny Top Beefy Bottom, and Mighty Slinky guitar sets feature the same great bright and balanced tone that Slinkys are known for, in new never-before-offered combinations. All sets feature nickel-plated steel wrap wire around a tin-plated hex core for that iconic Slinky feel and tone that players have relied on for decades.