Schacht makes a variety of spinning bobbins so that you are covered in any situation. If spinning single drive, either regular or high speed bobbin will work, so the bobbins that come with the wheel are just fine. if spinning double drive and using high or super high speed whorls, the high speed bobbin is required. This is necessary to keep the bobbin speed enough faster than the flyer speed to provide adequate draw onto the bobbin.
Travel bobbins have platic flanges instead of the standard wood. This makes them more economical and more durable. All of the bobbins have a plastic core.
Schacht bobbins are a nice size--larger than Ashford and smaller than Louet. The bobbins, regular or high speed, hold approximately 3.5 ounces of yarn.