This is the warmest, roundest sound you can get! Olivs are also the brightest of the Pirastro gut family. All its gauges offer very similar qualities but because these are also the thickest of all strings, people may prefer the lowest gauge to try them. If you haven't played on gut before but you really want to try them, be sure to play in an environment of stable relative humidity, as the gut will shrink and the wounding silver will loosen and "rattle" if you live in a dry place. (I live in West Texas so I have to have humidifiers running 24/7 in my house and office). Gut may not be for everyone, but once I started playing on these Olivs eleven years ago, I never went back to steel. My cello (old French) loves gut!