D'Addario J53 Ukulele Strings, Hawaiian-Concert Set of four strings Musical Notes A, E, C, G - Item# Diameter Tension *PL013 0.013 inch (0.33mm) 27.4 lbs (12.43 kg) *PL017 0.017 inch (0.43mm) 26.3 lbs (11.93 kg) EXPPB026 - 0.026 inch (0.66mm) 35.3 lbs (16.01 kg) *EXPPB035 - 0.035 inch (0.89mm) 36.8 lbs (16.69 kg) EXPPB045 - 0.045 inch (1.14mm) 34 lbs (15.42 kg) *EXPPB056 - 0.056 inch (1.42mm) 29 lbs (13.15 kg)