Pirastro Wondertone Gold Label Series Violin E String 4/4 Size Medium Ball End Wondertone Gold Label Series Violin E String 4/4 Size Medium Ball End Wondertone E string for violin Core made from a modified synthetic fiber, characterized by a quick and easy response, remarkable stablility, and a short break-in time The set is well-balanced and resistant to changes in temperature and humidity It has a direct and focused sound