Louët S-10 and S-15 Fatcore high speed Bobbin for Bobbin Lead (Irish Tension) wheels

Fat core bobbins have a 2" clear lucite core and the same spinning ratios and size as the high speed bobbins, but produce a lighter pull on the yarn for greater control when spinning finer threads. Ratios are: 6.5:1, 9.5:1, 15:1.