D'Addario J4404 Single Guitar String

Pro-Arte Extra-Hard D String for Classical Guitar

The D'Addario J4404 is a single replacement string built specifically for the D (4th) position of a classical guitar. As part of the Pro-Arte Extra-Hard Tension line, it addresses players who find standard or normal tension D strings too soft or lacking in projection. The string features a round-wound silver-plated copper winding over a nylon core — a construction that gives the D string a warmer, more substantial voice than a plain nylon treble. This single-string format is ideal for replacing a worn D without buying a full set, or for customizing tension across an existing Pro-Arte setup. Made in the USA to D'Addario's standard production specifications, it pairs naturally with the rest of the Extra-Hard line for a balanced set.

Technical Specifications

• String Position: D (4th string)
• Gauge: .030" / 0.76 mm
• Tension: Extra-Hard
• Core Material: Nylon
• Winding: Round-wound silver-plated copper
• Ending: Tie-end
• Coating: Uncoated
• Compatible With: Classical guitar
• Country of Manufacture: USA

Who This String Is For

The J4404 is the right choice for classical guitarists who need a replacement D string with extra-hard tension — players seeking more resistance, volume, and a firmer response under the right hand than normal or hard tension provides. It suits fingerstyle performers and advancing students who want a more substantial feel in the lower treble register without committing to a full set. The tie-end fitting is compatible with traditional slotted classical bridges, and the round-wound silver-plated copper construction pairs well with the rest of the Pro-Arte Extra-Hard line. As a single string rather than a full set, it works for targeted replacements or custom tension builds.