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Double Bass 1/2 size Strings

100cm is the scale of the instrument.
The 350A set is tungsten, while the 300A is nickel.
(hint: A stands for 100cm)
The 350B (and 300B) sets are for a 90cm scale.
C stands for 80cm and D for 69cm. (D only available in tungsten)

90cm = 35.4 inches
80cm = 31.5 inches
69cm = 27.2 inches

Plus some slack at the bottom and at the top.