The range of tones these strings can produce is determined by three primary factors: the linear density of the string, that is its mass per unit length (which is determined by its thickness and the density of the material), the tension placed upon it, and the instrument's scale length.
There is some variation in the scale length of an orchestral double bass, generally in the range 41.3–43.3 inches (1,050–1,100 mm).
Smaller scale instruments are also quite commonly used by fully-grown players in jazz, folk music and similar ensembles.
However, beginning in the mid-20th century luthiers seeking increased volume moved to a 26 inches (660 mm) scale, which is now the standard for such leading makers as Ramirez.
Electric guitars reflect the range of scale lengths found with steel-string acoustics.
Most Fender electric guitars, including the Telecaster, Stratocaster, and Jazzmaster, use a scale length of 25.5 inches (650 mm).
Gibson uses a scale length of 24+3⁄4 inches (630 mm) on most of its electric guitars, including the ES-335, Les Paul, SG, Flying V, and Explorer.
Gibson's nominal "24.75" in scale length has itself varied, sometimes measuring 24+5⁄8 or 24+9⁄16 inches (625 or 624 mm) depending on the production equipment used.
The larger models, about 6 feet (180 cm) or more in scale length, may have the full grand piano action, and are used in smaller concert spaces.
Others are intended for larger homes, and may have a simplified action lacking the repeat lever that is only useful for advanced players.