Pirastro Obligato Series Violin E String 3/4-1/2 Size Steel Ball End Obligato Series Violin E String 3/4-1/2 Size Steel Ball End Obligato E string for violin Core made from new synthetic fiber, available in a variety of guagings with loop or ball end options Warm, rich, sonorous tone quality, very rich with overtones Impressive amount of volume, very dynamic response and great playability