A proprietary bronze and tin alloy that La Bella uses in its 7GPM Phosphor Bronze acoustic strings gives them a brighter tone and longer life than any other phosphor bronze strings on the market, according to the manufacturer. The 7GPM set is medium tension.
La Bella introduced the Phosphor Bronze Series in the 1970s, and they're now the company's most popular acoustic sets.
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 | Phosphor bronze |
| D/4th | .035 | Phosphor bronze |
| A/5th | .046 | Phosphor bronze |
| E/6th | .056 | Phosphor bronze |
