"Worked for me"
As these were reduced I bought them to try. I didn't really think they would be much use, but they worked! I used them on a few icing bags, with the smaller metal icing nozzles, to flood ice some biscuits. I went from one to another bag as I used different colours and they did keep the nozzle less messy and did not dry out as much. I tested without the nozzle covers and got that crust on the end! You need to push them down quite firmly to cover and to keep them on, but I will use them again.