Pirastro Obligato Bass Strings*Basic Trial Sets limited to 2 per customer* Features Obligato strings have a core made from a modern synthetic multifilament fibre which is wound with chrome steel. bright, brilliant and focused sound growly tone especially true for the E string very quick response suitable for arco and pizzicato exceptional well balanced set completely impervious to changes in temperature and humidity Set Variations Orchestra tuning Solo tuning Tuning in 5th: A D G