Review on 🧵 Doublelin Prewound Plastic Sided Class 15 Bobbins, Size A, 144pcs, Black Color - 100% Polyester, 75D/2, 140 Yards - Compatible with Babylock, Berenia, Brother, Janome, Juki, Singer by Jessica Lewis

I bought 2 packs of 144 prewound bobbins, 1 white and 1 black. I used the 1st layer coils with no problems, now none of these can be used on my 2nd layer black coils. If you see the picture on the left, it's a spool that's wound so tightly that it can't unwind on its own as desired. It's almost 9am and 3 patches are ruined, consumables and wasted time due to bad coils. How do I know it's bobbins and not a machine, simple as if I switch brands and make the same design in the same colors with the same needle it doesn't happen. I am now afraid to use them at all, not only because of the time, loss of consumables, but also because it can ruin my rather expensive embroidery machine.