I have a Singer CP6350M sewing machine, everything works. I was a little worried that I would have tension issues since they weren't wound onto my machine, but they ended up working fine. So far I've only used 3 of these (2 white and 1 black) and haven't had any problems. If I could change one thing I wish the case they came in was a little more solid, but it still works fine. . Overall I'm very happy with the purchase - it saved me a lot of time not having to wind my own bobbins, especially for black and white yarns.
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