The bulky bobbin was designed to hold bulky yarns. If your intentions are to spin novelty yarns on a regular basis, this is the bobbin for you. The bobbin will hold 250-400 gr of yarn and its ratio’s are 6.2:1, 5:1, and 4.2:1. To use the bulky bobbin, you will need the wide flyer as well. The Bulky bobbin will fit on all current and discontinued Louet wheels EXCEPT: S40, S45, Victoria, S87, S90.