Be careful where you buy your bobbins. I bought some for my Pfaff at JoAnn's and my machine ended up in the shop and 2 of my bobbins from JoAnn's had major cracks in them and were unusable. The repairman phoned me and asked me to bring in my bobbins so he could check them out as the machine was fine but he suspected I had defective bobbins. He went through all 15 that I had and ONLY the ones I bought fromthe Pfaff dealer did NOT have cracks in them. Every single one from JoAnn's had at least one or more crack in them for some odd reason - not all bobbins are made equal evidently.