Strings (tennis)
In tennis, the strings are the part of a tennis racquet which make contact with the ball. The strings form a woven network inside the head (or "hoop") of the racquet. Strings have been made with a variety of materials and possess varying properties that have been measured, such as dynamic stiffness, tension retention, thickness (gauge), string texture (shape of the string), and rebound efficiency.
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.