[Materials]: The bobbin organizer is made of high-quality and high-hardness ABS plastic, which is strong and and not easy to break. The dual strong magnets have a strong suction force of up to 3000GS and can be well adsorbed on the sewing machine. Silicone anti-slip shock-absorbing design, no noise and no movement. [Easy to Use]: Attach the bobbin holder to the sewing machine, and place the bobbins on the bobbin holder according to categories for easy storage; when disassembling, just lift it gently with your hands. [Magnetic Bobbin Holder]: These magnetic bobbin holder be your organizing assistant, effectively preventing the thread on the spool from becoming entangled, saving storage space, helping you organize the sewing machine table, and can also classify the color or different types of Bobbin. Size: 67 x 112mm.Computerized flat lathes/synchronized lathes/double-needle lathes/knotting machines/buttonhole machines and other machine bobbins can be used.