Another more modern design with Kromski's gorgeous craftsmanship. The Sonata is Kromski's traveling wheel and it folds up neatly so you can tuck it into the included backpack. 
The original Sonata design has been discontinued. A new design with a magnetic flyer has taken its place called the Sonata Encore! Limits amounts of the original Sonata remain but when they are gone they are gone. 
 
Specifications :
Wheel Diameter : 50cm (19 inches)
Orifice Circumference : 10mm (3/8 in.)
Standard Whorl Ratios: 6.7, 12.5 and 14:1
Whorls 5, 7.5 & 10:1 and 12, 16 & 18:1 available
Standard, Fast and Jumbo Flyer available
Unique self-lubricating plastic bearings on front
Sealed ball bearings at wheel hub
Durable brass bearings on treadles
Hushed plastic bearings in bobbins
Single Drive with Scotch Tension
Double Treadle
On board Lazy Kate (2 bobbin capacity)
Total Wheel weight : 5kg (11.5 lbs)
 
Includes :
3 bobbins (120g/4.2oz capacity)
Spinning Wheel Oil
Threading Hook