I have a Bernina 630 and I buy Bernina bobbins. I like having lots of bobbins just ready to go so I have at least 40 bobbins and I wind most of them up with ecru or light grey. When I am ready to quilt a quilt I will wind at least 3 or 4 with thread to match the back. Sometimes the spool of thread spins a lot as I wind and that makes noise. Even JoAnns carries bobbins for different makes, I bought 3 pkgs with a 50% off notions sale. 4 came with my machine and I bought 4 more from my dealer and then bought a batch of 15 or 20 on e-bay