This flyer unit works with the Kromski Sonata, Prelude and Interlude.
Due to the different sizes of the wheels the gear ratios will differ slightly between each wheel. The High Speed Flyer will convert to:
Sonata: 12:1, 16:1 & 18:1
Prelude: 11:1, 14.5:1 & 16.5:1
Interlude: 13.3:1, 17.5:1 & 20:1
The flyer unit does not come with a bobbin, however standard Kromski bobbins will fit the unit.