Silk is soft, smooth, sensual — and surprisingly practical, at least when it comes to protecting your guitar.
Martin wraps the ball ends of its MA550S Marquis 92/8 Phosphor Bronze acoustic strings with soft silk. The silk helps protect your guitar's bridge and end plate as you play.
These medium gauge strings are made with tin-plated steel core wire and Phosphor Bronze wrap wire.
| Note | Gauge (in.) | Material |
| E/1st | .013 | Plain steel |
| B/2nd | .017 | Plain steel |
| G/3rd | .026 | Phosphor bronze |
| D/4th | .035 | Phosphor bronze |
| A/5th | .045 | Phosphor bronze |
| E/6th | .056 | Phosphor bronze |