Jargar Strings JVA-SETM Classic Viola String SetThe Classic Viola Strings are made of a very flexible steel core and they produce a big, powerful, distinct and well balanced tone. They are easily combined with other brands and especially the A string is often combined with other brands. The Viola strings come in three different tension Forte (Red), Medium (Blue) and Dolce (Green). The A string is made both in the loop and ball end versions.