What You Get: The package includes 2 pieces sewing machine bobbin case, 10 pieces metal sewing machine bobbins and enough accessories for sewing. Size: Each bobbin case is about 21mm in diameter and can be used for most sewing machines, such as Babylock, Bernina, Brother, Elna, Janome, Kenmore, Singer and more Bobbins and bobbin case for sewing with sewing machines: The sewing machine bobbin is made of metal and is durable. With long-term use, these bobbins can stop spinning faster, effectively prevent the bobbin thread from unwinding or tangling when sewing, and the bobbin case cover serves as a replacement part for sewing machines with front loading bobbin system Note: The data is all measured manually, please allow 1-3 cm error due to light and display difference, there may be color difference, please refer to the actual item received.