|To identify the type/size etc of thread on a bobbin which has not been completely used I write the type (silk/cotton/etc), size, brand, color number, etc. or whatever identifying information may be needed for identification on a sticky folder tab. The type put on the tab of manila file folders for identification of contents. For the bobbin, I cut it in half lengthwise to fit around bobbin. I wind the sticky tab around the bobbin over the thread, overlapping the tab itself. I then turn under a tiny bit on the end, which I use for easy removal of the sticky tab when I want to use the thread. This not only keeps the thread neat and on the bobbin, but also lets me know exactly what it is.