Phosphor Bronze Med Light 12-54 for steel stringed acoustics. Ernie Ball Earthwood Phosphor Bronze Acoustic Guitar Strings are made from 92% copper, 7.7% tin, 0.3% phosphorus wire wrapped around tin plated hex shaped steel core wire. These guitar strings have a light orange, gold color and provide a mellow, ringing sound, with excellent clarity. 2148 Earthwood Phosphor Bronze Light:

    E: 12
    B: 16
    G: 24 wound
    D: 32 wound
    A: 44 wound
    E: 54 wound