Cobra Class 3 & 4 Bobbin

Took a gamble on this bobbin for my heavy-duty sewing projects, and it's machined precisely enough that the thread feeds smoothly every time. The weight feels solid in hand, which gives me confidence it won't warp under stress.

The bobbin casing is machined precisely, so the thread feeds smoothly without any snagging. I've had trouble with cheaper bobbins before, but this one fits my machine perfectly and the tension is consistent.

Finally, a bobbin that fits my heavy-duty machine without any wobble — the precision machining is noticeable compared to others I've tried. The black finish makes it easy to spot against the thread, a nice little detail.