They do what they supposed to do, by not spraying insecticide causing breathing problems.
Very effective, have caught more than a dozen small flies in a few days.
Easy fit and removal and very effective
I have never seen this type of fly catcher before other than the long sticky papers which look hideous
Bought this last week, due to the fact we live in the country, next to farm land, we do suffer with flys in the dry season, the sunflower stickers work well to keep the pest under control.
I've used these before and they are both simple to use and effective.
