Female/Female Bobbins
| FF-M6 Thread |
 | Cylindrical bobbin with M6 female threads both sides |
|
| FF-M8 Thread |
| Cylindrical bobbin with M8 female threads both sides |
|
| FF-M10 Thread |
| Cylindrical bobbin with M10 female threads both sides |
|
| FF-M12 Thread |
| Cylindrical bobbin with M12 female threads both sides |
|
| FF-M16 Thread |
| Cylindrical bobbin with M16 female threads both sides |
|
| FF-M20 Thread |
| Cylindrical bobbin with M20 female threads both sides |
|
