d' - 2nd - Re .011 /0,28 mm plain steel

a - 3'· - La .014 / 0,36 mm plain steel

a - 4'h - La .014 / 0,36 mm plain steel

d' - 5'h - Re .011 /0,28 mm plain steel

f - 6'" - Fa .022 / 0,56 mm nickel wound

d' - 7'h - Re .011 /0,28 mm plain steel

c - 8'h - Do .030 / 0,76 mm nickel wound