What you get: package includes 2 pieces of sewing machine bobbin case, 10 pieces of metal sewing machine bobbins, enough supplies for sewing Size: each box bobbin case is about 21mm in diameter, can use for most sewing machines, such as apply for Babylock, bernina, brother, elna, janome, kenmore, singer and more Bobbin and case for sewing machine Sewing: The sewing machine bobbin is made of metal material, durable for long time use, these bobbins can stop spinning faster, effectively prevent the bobbin thread from unwinding or tangling when sewing, and the case is applied as spare part for sewing machines with front loading bobbin system Simple and practical design: This hook bobbin case adopts simple and practical design, easy to replace and use.