Dominant 15"-16" Viola String Set - Medium Gauge - Thomastik Infeld Full String Set includes All Ball-End Aluminum-Wound Perlon-Core A, Aluminum-Wound Perlon-Core D, Silver-Wound Perlon-Core G, and Silver-Wound Perlon-Core C For 15"-16" Viola Medium Gauge Dominant viola strings are one of the most widely-used synthetic strings. A highly flexible, multi-strand perlon core makes these comparable in sound and feel to natural gut. These strings are also popular with electric viola players.