I purchased 3 of these for my music studio. We have students that play various guitar styles, brands and sizes. These work pretty good for educational purposes but each one varies on the tightness. On my Breedlove Concert guitar, it is a very tight fit. On my Martin 12-String guitar, it fits perfectly. Over time the capo has been able to loosen up a little bit but if you don't want to work it out, you might want to look at a different model.