There are many on here to choose from, but I designed this one in Tinkercad around the thread tag itself, to eliminate the need to trim the tag when adding it. I strengthened the ring attachment area to prevent easy breaking and designed in a slight slope to the thread square itself to prevent the threads from catching when pulling it off the bobbin. I've left enough room on the sides at the top of the bobbin for a set of initials for personalization or numbers to be added into the model if you prefer to have both the tag AND permanent numbers. Additionally in the ones I designed for a family member, I added a pause halfway to add aa small NFC chip to the top right corner of the model for quick easy inventory of the floss or re-ordering when almost empty. Each NFC tag can be programmed for the corresponding color. If I can figure out how I will link the ones I chose below, small and cheap for 50 on Amazon!