INNOVATION Double Bass strings are manufactured in the U.K. and offer double bass players a 'Gut like' sound without the problems associated with traditional gut core bass strings.  All the Innovation bass strings feature non-metalic synthetic (nylon) Cores and they come in Three Tensions: High, Medium, and Low. Mostly these strings are for pizzicato (plucking) style play,  but one set the 140H Honey work well for arco play. These strings work well with piezo pickups, not for magnetic pickups.