Review on 🧵 Premium 144pcs Size A Prewound Bobbins for Brother Embroidery Machines - Plastic Sided, Class 15, 15J, SA156, White Color - 100% Polyester, 60S/2 - 100 Yards by Amanda Castillo

GOOD: They were well packaged, wound well, had quality thread and shipped quicker than anything else in my main order. If your machine uses a flat coil, this is a flashy deal! Luckily I have a Brother embroidery machine that can do this. However, I was hoping to use them in my base machine. BAD: I knew my Singer Classic was 15 J but they said they were compatible so I ordered. Immediately he skipped stitches like crazy! I stopped twice and refueled the machine, cutting out large areas of skipped stitches. I then switched to a pre-wound Singer spool and the problem was solved. You can see that the Singer 15J is rounded and you can see the difference in the stitching on the blue Star Wars mask compared to the mess on the eagle mask. The Singer Classic says "No!" If you have a 15 Joule machine, check flat coils before ordering pre-wound ones. I don't think they are the problem as there was no discernible quality issue.