Thomastik-Infeld Double bass strings Belcanto - A x (BC61S)Steel rope core especially developed for bow play Chrome wound Soft, warm sound, excellent response Excellent bow response for classic Natural pizzicato sound for jazz Solo tuning. 3 4 size for scale length 1040 1060mm (41 41. 7"), also suitable for 4 4 size up to scale length 1100mm (43. 3"), medium tension A: 29. 5kg 65. 1lbs E: 29. 8kg 65. 6lbs H B: 29. 8kg 65. 6lbs Fis F#: 29. 3kg 64. 5lbs Set of 4 strings consists of A, E, H B and Fis F# strings,