These are excellent for rental instruments. No damaged to the neck of the instrument, easy to remove, easy to apply, and does not warp or slide around the neck when under stress or work.The only minor downside: The tape is thick enough that (on some instruments) slide notes start to latch to the closest note, as the tape actually contact the string as your finger approaches the fret.Given that slide notes never happened while I was in orchestra for 8 years, and only appeared now that I'm making my own songs, I still rate this 5/5 stars, because it should absolutely be perfect for the vast majority, who are renting stringed instruments for classes.Even if you ARE doing slide notes, there is a way to apply the tape to get around the issue: Don't let the tape surround the entire neck. Remove small segments of the tape that are underneath a string. This way, you still have a reference line on either side of the string, but it won't ever mute the string itself accidentally.