The String Centre FG Series Fiberglass Viola Bow 13-14 in. Through the careful exercise of engineering and science, The String Centre FG Series Fiberglass Viola Bow sets new standards for affordable bass bows, providing sensitivity, balance, and nuance previously unattainable in economical fiberglass bows Through the careful exercise of engineering and science, The String Centre FG Series Fiberglass Viola Bow sets new standards for affordable viola bows, providing sensitivity, balance, and nuance previously unattainable in economical fiberglass bows Through the careful exercise of engineering and science, The String Centre FG Series Fiberglass Viola Bow sets new standards for affordable viola bows, providing sensitivity, balance, and nuance previously unattainable in economical fiberglass bows