It's fantastic to have extra bobbins! I normally fill several bobbins (depending on size of quilt) with color using on quilt. Saves time when working. If I don't use all of the wound bobbins, they go on a pipe cleaner inside the cone of matching thread.
I am pleased with the Juki longarm bobbins. They arrived in excellent condition and in a timely manner. I will order from here again.
This bobbins work great