I currently have Helicore Solo's on my Kay for the E & A. They are tuned to regular pitch. Not much sustain but a nice clean thump. Very easy on the left hand and very easy under the bow. They seem more tolerant of a lousy Arco player like myself then than my Evah Mediums which I have on the D & G. The Solo's have have a lot less sustain than Helicore Medium Hybrids but more thump.