I've been using these strings for a couple of years now on my fretless. They last forever. I use DR Hi Beams on my fretted bass and change out the strings every couple of months (I play that bass about 40% of the time). The Kerly's on my fretless get changed every 3-4 months. The tone of the strings changes so imperceptibly over time that the only way I know to change them is when I have trouble getting them in tune! Did anyone mention they are easy on the fingers too?
Kerly Music Strings?? 
