The Jumbo Flyer adds nearly 2 times the space for yarn over the already great size regular bobbin, so if you are plying or just spinning singles, you can put more on a Jumbo bobbin. The orifice on the Jumbo Flyer is .7 inches, so you can spin thick yarn or do heavy plys. The ratios are great for low or medium speeds. For some, this will be the flyer for general purpose spinning. Each Jumbo Kit includes one jumbo bobbin with the whorl built into the flyer and fits all of the following Single Drive Wheels:
Sonata – ratios of 5, 7.5, and 10 to 1.
Prelude – ratios of 5.5, 7, and 9 to 1.
Interlude – ratios of 5.5, 8.3, and 11 to 1.