What You Receive: You get spools, enough for your daily sewing needs. The bobbins are compatible with most standard sewing machines, compatible with , Singer, , etc. You can also use them for hand sewing or embroidery projects. High Quality Material: Our clear sewing machine bobbin is made of premium material, hard plastic, and can be reused. The edge of the sewing machine bobbin is smooth, which 't break the sewing thread. The transparent design allows you to clearly see how much sewing thread remains, so as to better prepare the bobbin thread Special Performance and Design: These sewing machine bobbins have a unique bobbin design, which allows you to wind the thread quickly and evenly. The bobbin also has a locking mechanism, which prevents the thread from slipping off or unwinding. The bobbins have a standard size of 6.2mm in diameter and 1cm in height, which fits most sewing machines and bobbin cases. Easy to Use: The bobbins are easy to install and remove from your sewing machine or bobbin case. You just need to insert the bobbin into the bobbin holder, thread it through the tension spring, and then pull it out when you are done. You can also use the included storage box to organize and store your bobbins neatly and conveniently. Wide Application: Sewing machine accessories are suitable for types of sewing projects, such as quilting, patchwork, garment making, home decor, crafts, etc. You can use different colors of thread to create beautiful and colorful patterns on your fabrics. The bobbins are also great gifts for your friends or family who love sewing. Colour:Transparent Material:plastic Size:Axis diameter 6.2mm Package Contents: 1000x Embroidery Bobbins Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.