Update: I can't justify a 4-star review. Down to 2 stars. These are simply useless, they come off within minutes.
If you keep the area where the plaster is perfectly clean and dry and don't move around too much, and preferably cover it with gloves or a sock or other fabric, it's ok. Otherwise it'll come off very quickly. As most of my bandage needs are on my fingers and hands, these are not very long-lasting - off within minutes.