very strong scruples, whether this is a solution to the problem, I am now totally convinced after half a year. Even my otherwise not convincing wife swears now on these roles. Normally, our beloved cat came every other day at least one tick into the house; the wife after a day gardening also. After spraying so that it was over. Throughout the summer, the cat has 2 ticks; she has almost certainly brought in further distance to our property. We are very satisfied and these roles for next summer will order again.