The Standard Janome Bobbin.
There are several types of bobbins on the market. Using the incorrect size and type of bobbin can affect stitch quality and could possibly damage the machine. These clear plastic bobbins are compatible with all Janome Sewing and embroidery machines except the 1600P, HD9, MB4, and MB7. 
This bobbin comes standard with most Janome Sewing Machines
Rubber added to the clear resin improves performance and reduces noise. Imprinted with the letter J