Flexible rubbery plastic expands to grab bobbin -- then snugs up around it. Threads can't unwind. Holds over 20 bobbins. Colors may vary.
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October 3, 2014
I have 3 of these and they are wonderful!! I have 2 sewing machines that use different bobbins and I can use a different color for each machine. The bobbins do not fall out nor do they unravel.