This coating gives the very hard steel wire an outer softness and resistance to corrosion. After tinning, the wire is drawn through round diamond dyes to produce the extremely smooth surface for the plain unwound treble strings or through hexagonal diamond dyes to produce the hex core wire for round wound strings. The amount of tension each string requires can vary greatly. If an instrument is usually weak-sounding you can compensate for the deficiency by selecting strings with higher tension. A thin string will vibrate faster than a thick one when both are at the same tension.
Light strings can move more rapidly, and faster vibration rates produce higher tones.
That's why the thinnest strings are used in the treble register and the thickest strings are used in the bass register. Violin String Adjusters String adjusters attach to the tail piece and provide fine tuning adjustment. They are required whenever steel strings are used. The first string of the violin is often steel and requires an adjuster. A steel core is often used for all strings on student instruments - requiring strings adjusters for all four strings.