This Akerworks Flat-Pack Bobbin is compatible with spinning wheels by Majacraft using a standard flyer. Please specify your choice of whorl style and color when ordering. Please note: all styles except Bike Tire are compatible with Aura wheels. Please also note: Aura wheels commonly ship with a jumbo-sized flyer. Though this bobbin is compatible with that flyer, for optimal capacity you'll wish to use our jumbo Majacraft-compatible bobbin.