About the product
- Set of 4 class 66 metal bobbins
- Class 66 bobbins are compatible with many SINGER models 66-1 through 66-18, 99CL, 185, 192, 201, 609, 717 and other top drop-in bobbin sewing machines
- Never add thread to a partially wound bobbin as it may be uneven and cause thread to tangle or break
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