What you will get: The package includes 4 pieces, a sewing machine bobbin case that you can change and replace according to your own interests, or share with others. <br> Application: the Robin box is used as a spare part for a front-loading bobbin sewing machine, and can also be used as a spare part <br> Function: The bobbin can stop threading faster, effectively preventing threading. lower thread from loosening when the sewing operation stops and starts. <br> Material: The bobbin case is made of stainless steel, which is durable and very practical for long-term use. <br> Packing list: 4 * sewing machine bobbin case <br> We only sell sewing machine bobbin case, not other items in the picture. <br> Due to the differences between different monitors, the pictures may not reflect the actual color of the item. Due to manual measurement, please allow slight size errors.