This bobbin holder creates easy-to-adjust thread tension when embroidering with non-Janome bobbin thread. The bobbin holder market with a yellow dot has 20g tension. Note - Janome bobbin thread is finely tuned for use with the standard bobbin holder which is usually set at 10g tension for embroidery machines. Non-Janome bobbin thread tends to be thinner or less resistant than Janome bobbin thread so it may need more tension when embroidering.