Louet
Louet Spinning Accessories
The standard bobbin has three ratios: 5.5:1 for slow spinning and heavy yarn; 7.5:1 for medium yarn; and, 10.5:1 for fast spinning and fine yarn. Bobbins will hold approximately 200+ g. of yarn.
The high speed bobbin's ratios are: 6.5:1, 9.5:1 and 15:1.