Cellos normally do not have an E string at all, so it is nice that somebody thought about a product like this and put in the effort to make it work. So I don't have a regular acoustic cello but I have an electric cello I got on the cheap, so I decided to try it out. This E string works and now my cello is what a violin is to a viola. This Cello E string is everything it sets out to be, and delivers perfectly.