What you will get: The package includes 4 sewing machine bobbin cases that you can change and replace according to your own interests, or share with others Application: The bobbin case is always used as a replacement part for sewing machines with a front-loading bobbin system and can also be used as a spare case Function: The bobbin can stop spinning faster, effectively preventing the bobbin thread from unraveling or tangling when the sewing operation stops and starts Size: Each bobbin case measures approx. 2 2.75mm diameter, suitable for most sewing machines such as Babylock, Bernina, Brother, Elna, Janome, Kenmore, Singer, etc. Material: The bobbin case is made of stainless steel, durable and very practical for long-term use