This 3 speed fat core bobbin for the S90 has a clear lacquered finish. The bobbin has a sheave with three settings on one end to obtain three different spinning speeds but also has a core of 50mm (2"). The fat core affects less pull on the yarn for more control on cotton and fine slippery fibers. The ratios are: 6.5:1, 9.5:1 and 15:1.
