D'Addario XB145SL Single Bass String

D'Addario XB145 Single String — Heavy Low-End for Super Long Scale Basses

The D'Addario XB145 is a single replacement bass string in the XL Nickel Wound family, built for super long scale instruments with scale lengths reaching up to 38 inches (965 mm). Its .145" gauge makes it the heaviest single in the XB line, suited to the lowest position on a four-string bass or to extended-range setups that drop below standard E. The nickel-plated steel wrap wire is digitally wound for consistent tension and intonation from string to string. Made in the USA and shipped in corrosion-resistant eco-friendly packaging, this string is sold individually so players can replace a damaged low string without buying a full set, or assemble a custom gauge combination tailored to their tuning and touch.

Technical Specifications

• Gauge: .145" / 3.68 mm
• Number of Strings: 1 (single string)
• Material: nickel-plated steel
• Winding Type: roundwound
• Ending: loop-end
• Scale Compatibility: super long scale, basses up to 38" (965 mm)
• Manufacturing: USA

Who It's For

The XB145 is the right choice for bass players running super long scale instruments — including five- and six-string basses, extended-range setups, and any bass tuned down to low F# or below — who need a heavy-gauge low string with clear fundamentals and reliable intonation. Its bright nickel-plated steel character suits rock, metal, and studio work where the lowest note has to cut through a dense mix without sounding muddy or floppy. Players who prefer to mix and match individual strings to dial in their own tension and feel will appreciate being able to buy just the .145 without committing to a full set. The loop-end fitting should be matched to the bass's tailpiece design before installation.