Louet Fatcore hot Bobbin

hot The 3 speed fat core bobbin can be used on the S10, S10DT, S15, S51, S51DT and S75 wheels. It has a clear core to mimic the effect of a partly filled bobbin which lessens the pull on the yarn, allowing you to spin finer yarn. Speed ratios are: 6.5:1, 9.5:1 and 15:1. Note: Does Not work on S87, S90, Julia, or Victoria.