I like poly Guterman in the bobbin. It's not very thick, so I can wind more. That little bobbin run out quickly with cotton thread in it. Anything on the top. C&C cotton wrapped poly, okay, Guterman, okay, connecting Threads cotton - linty in the bobbin area, but sews well. Rayon quilting thread in both, okay. In other words, AnnieRose is not a fussy machine.