Detail 01
Single G string
Just the top string. Your other three stay as they are, so the new G may sound brighter than its neighbors for a while.

Independent shopping perspective
A single G string for 4/4 double bass, from Thomastik's Superflexible line. For bassists replacing one broken or worn string, not restringing the whole instrument.

Strong match
Consider the trade-offs
What matters in use
Catalog numbers tell only part of the story. These are the details most likely to change how this product feels, sounds, or fits into a setup.
Detail 01
Just the top string. Your other three stay as they are, so the new G may sound brighter than its neighbors for a while.
Detail 02
Cut for a full-size upright. On a 3/4 bass the silk winding can end up over the nut or bridge.
Detail 03
Mixing lines across one instrument gives uneven feel string to string. Match the rest of your set if you can.
Detail 04
Single-string pricing. If two or three strings are also worn, a full set is usually the better spend.
Final check
Product questions
Straight answers to the questions shoppers most often ask about this product.
Upright double bass. It will not fit an electric bass guitar.
It is cut for 4/4. On a 3/4 the string is longer than needed and the winding may sit badly at the nut or bridge.
No. Swapping one is normal when it breaks. Do it under tension one string at a time so the soundpost stays put.
It is new and they are not. Give it a week of playing; it will settle in and lose some of the initial brightness.