Check the listing for details. Organize Your Bobbins Stop Thread From Unraveling. Color: Clear, Condition: New. Listed at 3.99 USD. 12 pcs. Clear Flexible Plastic Rings that snugly fits around your bobbins, so that the thread will not unravel. Each packed intertwined. Two in each stack. Keeps your bobbins neat, no more tangles even if you drop it. Will fit any bobbin. Transparent so you can still see the thread color. You remove it when using the bobbin and you replace it once you're finished. How easy is that? Each pcs. $.33.BOBBINS COME IN DIFFERENT SIZES. FEEL FREE TO CUT TO SIZE IF IT DOESN’T FIT THE SIZE YOU HAVE. ANOTHER APPLICATION IT HAS WORKED IN: IS WHEN YOUR BOBBIN IS TOO LOOSE IN THE SHUCKLE (THE PLACE THAT HOUSES THE BOBBIN) YOU CAN CUT A PIECE THAT HAS THE GROOVE AND FIT IT AROUND THE EDGE OF THE TOP OF THE BOBBIN, AND IT WILL STOP IT FROM WOBBLING IN THE SHUCKLE. THIS NORMALLY HAPPENS WHEN YOU HAVE A SMALLER BOBBIN THAN REQUIRED FOR YOUR SEWING MACHINE. I HOPE THIS HELPS. THIS ITEM HAS MADE A BIG DIFFERENCE IN MY SEWING LIFE, BY KEEPING MY BOBBINS NEAT. WHEN SWITCHING BOBBINS, POP ONE OF THESE ON, AND IF YOU DROP THE BOBBIN AT LEAST THE THREAD WILL NOT UNWIND. IT ALSO MAKES FOR A NEATER SEWING BOX AND BOBBIN COLLECTION. *PS: I ALSO HAVE A VERSION AVAILABLE FOR THREADTHANK YOU FOR YOUR PURCHASE!