WonderFil pre-wound bobbins Size M are wound with our 80wt DecoBob™ thread in a reusable plastic bobbin, which means there is no glue or wax holding it together (which also makes for happy machines)! DecoBob™ makes for an ideal bobbin thread as using a finer weight thread will also minimize the bulk in whatever you are doing, however DecoBob™ also has the strength, versatility, and reliability you can count on.
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