D'Addario J4504C Single Guitar String

Replacement D String for Pro-Arté Composite Classical Sets

The D'Addario J4504C is a single replacement D (4th) string for classical guitar, built to match the Pro-Arté Composite string family. Its silver-plated copper winding sits over an exclusive multifilament composite core — the same construction used in the full EJ45C set — so a worn-out bass string can be swapped without changing the voice of the remaining strings. The composite core delivers a powerful yet warm tone and is rated to last 2–3 times longer than traditional nylon basses. For players who want to keep a balanced set without buying a full re-string, this single D offers a clean, consistent match.

Technical Specifications

• String Designation: D (4th string)
• Number of Strings: 1
• Tension: Normal
• Gauge: .028" / 0.71 mm
• Winding Material: Silver-Plated Copper
• Winding Type: Round Wound
• Ending: Tie-End
• Compatible With: Classical Guitar
• Made In: USA (New York production facility)

Who It's For

The J4504C is the right choice for classical guitarists who need a single replacement D string that matches the Pro-Arté Composite EJ45C set. It suits students and intermediate players who tend to wear out one bass string at a time and want to avoid buying a full set, as well as gigging players who prefer to keep a stable, balanced sound across the bass register. The normal tension and .028" gauge pair naturally with the rest of the EJ45C basses, and the tie-end construction fits any standard classical bridge. Because it shares the composite core technology with the full set, it also works as a brighter, longer-lasting alternative to a stock nylon D string on tenor guitars or other nylon-stringed instruments.