Originally Posted by BellaBoo
All the bobbins I use for a bobbin case are metal. I use plastic for the drop in bobbins.
I have two machines, one with a drop in bobbin and one with a front bobbin and they both use plastic.
I was helping a new sewer at quilting one time and she was having a terrible time with her tension and I discovered she was using a mix of bobbins. When she used the bobbins that were meant for her machine she didn't have any problems at all.