Strings (tennis)
The material used in tennis string can significantly affect a player's performance, and even health. Several materials are used to make tennis strings. They vary in terms of elasticity, durability, rebound efficiency, tension holding capability, and manufacturing cost, among other considerations.
Double bass
When choosing a bass with a fifth string, the player may decide between adding a higher-pitched string (a high C string) or a lower-pitched string (typically a low B). Six-stringed instruments are generally regarded as impractical. To accommodate the additional fifth string, the fingerboard is usually slightly widened, and the top slightly thicker, to handle the increased tension. Some five-stringed instruments are converted four-string instruments. Because these do not have wider fingerboards, some players find them more difficult to finger and bow. Converted four-string basses usually require either a new, thicker top, or lighter strings to compensate for the increased tension.