Louet Bobbin with 3 speeds - S15/S75DT/S17 - Unfinished

Unfinished Louet 3 speed bobbin for all standard wheels.
Ratios are: 1:5.5, 1:7.5, 1:10.5
Fits wheel models S10, S10DT, S51, S51DT, S15, S17 and S75DT.