Usually from metals such as steel and nickel. Like pure steel, nickel wrapped steel, pure steel etc
Actually, lengths of a bass does not depend on the number of strings. Basses can be of different length but this has no connection with the number of strings.
It is sometimes used when referring to the string section of the orchestra. The string section is made up of: violins, violas, cellos and double basses.
It is the lowest member of the String Family.
Typically 4-string basses are tuned from low to high: E A D G While 5-string basses add a low B string & you get this: B E A D G There are also the 6-string basses, which have a high C string: B E A D G C
Cello's, Basses, and piano's.
The double bass has 4 strings. It is a classical instrument that is related to the violin and cello, but is the largest in this family.There are basses that have more strings, but they are usually electric instruments, such as 5 or 6 stringed basses. As well, there are 8 and 12 string basses that have "duplicate strings" that are tuned to a higher octave to it's root string (similar to a 12-string guitar).
Given this category, I have to assume you are talking about electric bass guitar. If that is the case, then I can tell you that more bassists still play four string basses than all five and six string bass players combined.
A string orchestra, violins, violas, basses, cellos.
The standard scale length (from nut to bridge) of a bass is 34 inches. 5 string basses typically have a scale of 35 inches to keep the 5th string tight, and some basses have a shorter scale of usually 32 inches.
It belongs in the string instruments along with the classical such as : violins,violas,basses,cellos. String Instruments have a variety of instruments including the guitar.
Low E (The 5th white key from the left on a piano) on a standard 4 string double bass. Some double basses have a Low C extension on the E string, allowing it to play down to a low C. Five string double basses can go down to a low B.
4 usually, although one can get 5 and 6 string basses. However, it's best to play a four-string first.