These L" size bobbin cases are designed with a brake spring that applies constant, light pressure on the bobbins to prevent unraveling or tangling of thread during sewing operations. The bobbin diameter measures 21mm. These top cl NBL No-Back-Lash bobbin cases are compatible with many embroidery machine models using L" size bobbins. They help stop bobbins from spinning faster, ensuring smooth sewing performance. Suitable for various models, including those from brands such as Alphasew, Barudan, Happy, Meistergram, Singer, and Tajima, these pig-tail bobbin cases are ideal for embroidery machines. They are specifically made for Singer 20U, P20U33, P20U143, and compatible with multiple Tajima models like TM, TMB, TMBE, TMBW, TME, TEMEF, TMEG, and TMF. Designed to enhance sewing precision, these bobbin cases are essential for maintaining consistent thread tension and preventing thread jams during embroidery projects.
