Wood Violins Viper A string
These are the Wood Violins-branded A strings. The ball end of the string is red with a black winding. Any standard A string will probably work on the Viper, as the A string is on the short side of the angled tailpiece, but this is the A string that comes on any unfretted Viper. Fretted Vipers get (and Wood Violins recommends) the Helicore Titanium A string, which holds up better on fretted Vipers.