What you get: The package includes 4 pieces, a sewing machine bobbin case that you can change and replace according to your interests, or share with others Application: robbin case is still applied as a spare part for sewing machines with front loading spool system, it can also be used as a spare case Function: Bobbins can stop spinning faster, effectively preventing the bobbin thread from unwinding when sewing operations stop and start Size: each bobbin case is approximately 22.75mm in diameter, fits 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, can be used for a long time Product Applications: Application: The robbin housing is always used as a spare part for sewing machines with front loading spool system. It can also be used as a spare case. Function: The spools can stop turning much faster, effectively preventing the bobbin thread from winding or tangling when sewing operations stop and start. Specification: Material: stainless steel Size: approx. 22.75 mm diameter Color: silver Quantity: 4 pieces Package includes: 4 x Bobbin cases Note: Please check your sewing machine model before purchasing. The marks mentioned above are not applied as marks, just for compatibility reasons.