The Jumbo BobbinSaver® has the same great features you expect with the BobbinSaver®, but can hold larger bobbins. The channel has been expanded to fit bobbins with a 1-1/16” diameter. If bobbins are too loose, you can reshape the bobbin channel. Submerge in boiling water for 15 to 20 seconds. Remove and press sides together evenly around the circle, then dip in cold water.