Bobbins were from a 1950 Elna Sewing Machine. I know this because it was my machine and I used these many times with no problem. Buyer asked me to measure them, which I did. I told her to let me know if they didn't work with her machine and I would happily refund. She never contacted me and left a negative calling me a LIAR. When I asked why, she said I should have measured them with calipers, not a ruler and again called me a liar! She refused to remove false negative feedback. She has left many false negatives and ebay will do nothing.