The Pirastro Eudoxa Double Bass String Set are individually handmade gut core double bass strings. These double bass strings are renowned for their warm tone and strings offer brilliant sound, good modulation, and long sustain. The Pirastro Eudoxa Double Bass String Set is perfect for arco or pizzicato playing. The Pirastro Eudoxa Double Bass Strings are considered the Gut Double Bass String! From Pirastro: The gut core of the Eudoxa double bass strings stretches more than other strings. This means that when the strings are mounted the silk protection will not complete reach over the nut at first. However, this will happen with time. The silk winding needs to be so long in order to protect all of the part of the string that is wound over the peg, even when the stretching process is finalized. This will prevent the strings from breaking.