I use pre wound Magna Glides on my Juki TL 2010 which is on my Cutie frame. They give me more thread per bobbin so I stitch longer before changing the bobbin. Even winding so my tension is consistent. Easier to install thread into bobbin casing and casing into machine, they have a magnet that goes into casing and is held there no more fumbling as I insert into machine. For my other machines I wind myself.