When I bought my Singer 201 hand crank it came with 1 bobbin. I quickly found out that new class 66 bobbins are garbage for the most part, the inside hole was too small to fit my bobbin winder, some weren't exactly round. What a waste of money they were.
I am so happy that I don't need to find new class 66 bobbins. I bought a lot of 35 original metal bobbins on Ebay a few years ago. I have 4 machines that use this type of bobbin.