These work great for keep thread on the bobbin for storage. No more unraveling!Saves thread getting unwound/tangled when I inevitably drop my spools.My bobbin trays always had tails of thread hanging out, no matter how carefully I rolled the thread around. I bought these hoping they would do the trick, and they did. They do add height to the bobbin slots, so the lids won't close on the box style holders, but they work great on the open style without lids. The only thing I would change is to have them all clear with no colored ones. The colors add nothing, and the clear ones are better. Other than that, they are super!I find these bobbin holders very useful Item was delivered on time. Very pleased with this transactionReceived as expected. A little more loose than what I would like. It is a bit loose on a fully wound bobbin, and on one less full it is kinda floppy.Great little product that keeps me sane. Great to have all of my many bobbins organized and not a tangled mess. Purchased twice with no regrets.These fit the Brother bobbins that came with my machine as well as the off brand bobbins I purchased. They fit a bit looser than the original bobbin clips that came with my Brother original bobbins, but still work. Would purchase again.Slips right over bobbin. Can see color of thread