DR Strings DDT-13 Drop Down Tuning 13/65 Nickel Plated Electric Guitar Strings especially developed for dropped tunings, nickel plated steel, electric guitar strings are very much like the standard.The first thing you will notice about these strings is how stable they are…how they go right into tune and lock in. Players say “they are so stable it is almost eerie.” Now, you can stand and deliver in-tune notes at lower pitch that are clean and clear. Expect more and get more! Change tunings and be surprised how DDT strings lock in. Be surprised how little adjustments you make. DDT strings deliver far more than just heavy gauges.Drop tune with confidence. Drop tune with accuracy. DDT strings maintain their intonation at lower tunings far better than any other string we have everplayed or heard. Designed, and wound to answer the needs of the dark side.Gauges: 013-017-022-042w-056w-065w.