The single drive Prelude uses the same bobbins as all the other Kromski wheels, even the double drive wheels. This means that, as you consider adding a second or third Kromski wheel, you know your bobbins will work with all the different models.The Prelude is easy to treadle, very easy to transport. If you like, you can swivel the mother-of-all in line with the bench for a more compact "package" when moving the wheel or for storage. The Prelude is made of European alder and birch. This is a perfect wheel for reenactors. Additional specifications: Wheel Diameter: 18" Orifice height: 26"; size - 3/8" Weight: 9 lbs. Included rations: 6, 10.5 and 13-1 Accessories Included: 3 bobbins, threading hook, attached Lazy Kate and spinning oil.