This Jumbo Flyer/Bobbin Set from Majacraft fits all of their wheels.
Use it to spin bulky yarns or use it for plying - you can make a two-ply yarn from two of their standard bobbins and ply it on one Jumbo 4.75" diameter bobbin. The set consists of one jumbo flyer and one jumbo wood bobbin.
These are drop shipped directly to you. Allow about 14 to 21 days for delivery.