Many are confused with L size - which newer machines love!
Featherweight love the Class 15
What is a Class 15 style bobbin? The Class 15 is about the size of an American nickel. Its diameter measures approximately 20.3 mm and has a width of approximately 11.7 mm. This bobbin has two flat sides. Style L bobbins are typically used with home sewing embroidery and small commercial sewing machines.
Style L is the most common bobbin style used in home sewing machines.
It’s worth noting that the L Style bobbins are the same diameter as the Class 15 bobbins.
As such, you can use L Style bobbins in a sewing machine that uses Class 15 bobbins.
However, a Class 15 bobbin is too wide to fit in a machine that uses L Style bobbins.
Do you experience too many thread breakages or "bird's nest" of your bobbin thread when sewing?
One way to reduce those thread breakages, snaps or uneven tension when the bobbin spins and gives a "bird's nest" effect of thread on the under side of your fabric, is by using a special pre-wound bobbin
DECOBOB the bobbin of choice for convenient hand piecing!