Thomastik-Infeld Violin strings Vision solo - D Aluminium wound (VIS03)Modern synthetic core, wound aluminium or pure silver strings 4 4 Set medium (VIS01 VIS02 VIS03 VIS04) E: Multilayered steel, tin plated,Tension 8,1kg 17. 8lbs A: Aluminium wound, Tension 5,6kg 12. 3bs D: Aluminium wound: Tension 4,6kg 10. 1lbs D: Pure silver wound: Tension 4,9kg 10. 8lbs G: Pure silver wound: Tension 4,7kg 10. 4lbs Set tension with D Aluminium 23kp 50. 6lbs Set tension with D Silver 23,3kp 51. 3lbs