My Janome 1600P that I use for quilting uses metal, the Janome MC6500P that I use for piecing uses plastic and so does my Janome Harmony. The Singer 99K which I have in the closet uses metal. Use the one made for your machine....much less trouble that way.

All of my machines use metal bobbins. They came with the machines and that is what I use and have never had bobbin issues. That is why I wonder about pre-wound bobbins. In truth, I have never considered purchasing them.

I agree with quiledsunshine. Metal bobbin's in metal cases . For a drop in bobbin plastic bobbin's. Never have had any trouble.

I would not even consider putting a metal bobbin in my embroidery machine with the drop in bobbin. But when doing embroidery, you have a machine that is really doing a lot of stitching at a rather high rate. It's a two year old machine and it was designed for plastic bobbins. And they do expect the bobbin holder to wear, it even came with a spare.

I use metal bobbins in most of my other machines, but they were all designed to use metal bobbins.

Not always true. I've had two Pfaff electronic machines, both had metal bobbin cases and used plastic bobbins. My Babylock Serenade also has a metal bobbin case and uses plastic bobbins. I've never even seen a plastic bobbin case.

Funny, I was having trouble with my sewing/embroidery machine skipping stitches. I tired everything. The tech told me to use a metal bobbin instead of a plastic one. No more skipped stitches! It is a drop in bobbin. Unless the machine has a special made plastic bobbin, he said use a metal one in all of my machines. I trust him. He has performed miracles on problem machines that others gave up on.

Thanks everyone for your suggestions and comments. Rhonda - I will try to use tweezers when aiming for that "little" hole in my plastic bobbin...that might just do the trick!!

You brought up an interesting conversation. I purchased metal bobbins for my long arm and they were too small (their error), I tried them in my Phaff and they fit and look the same size as the Phaff plastic ones. I haven't gotten the nerve yet to try it though.

Check that they are the same thickness, because Pfaff plastic bobbins are thinner than most metal bobbins, and many plastic bobbins, too. By thickness I mean the space between the two round sides, not the thickness of the plastic sides.

My 1949 Singer 15-30 uses solid metal bobbins. I have newer metal bobbins that look the same size, but my old girl does not like them. They aren’t solid, having holes on the flat top & bottom. My Brother, bought in 2013, uses plastic bobbins, but they have to be ones with a slight inward curve to the ‘flat’ top & bottom. Truly flat ones don’t work in this machine. I’ve never tried to interchange bobbins between the 2 machines.