Just to clarify, these are the kind of bobbins you wind yourself, not the pre-wound kind.
They are Brother brand size SA155.
The ones I bought apparently are for the PE100, PE150, PE180, PE180D, PE200, PE300, PE400, PE400D, PC1000, PC3000, PC4000, PC5000. PC6000, PC6500, PC7000, PC8200, PC8500, PS1000, PS1200, PS1250, PS1700, PS1750, PS1800, PS1900, PS1950, PS2200, PS2300, PS2500. ULT 2001, ULT 2002D, ULT 2003D.
Thanks
Colleen