My Bernina takes the metal bobbins that came with it and also plastic bobbins that came with my White.
The Featherweight and the 301 use the same bobbins: larger around and thinner.
I have a 10 hole bobbin that is very thick, and don't know what it is for.
The Singer Red Eye needs a thinner bobbin. I don't have that one working yet, so don't know what works in there.