La Bella winds the 40PM set with a proprietary 80/20 brass alloy that produces a very bright tone with a long sustain. The medium tension acoustic set also has a resilient string tension to ensure ease of playing.
The strings are made in the USA with American wire.
| Note | Gauge (in.) | Material |
| E/1st | .013 | Plain steel |
| B/2nd | .017 | Plain steel |
| G/3rd | .026w | 80/20 brass wound |
| D/4th | .035 | 80/20 brass wound |
| A/5th | .046 | 80/20 brass wound |
| E/6th | .056 | 80/20 brass wound |
