These truly work in the multi-pronged arsenal against fleas. They attract and trap them, so you can see how your additional efforts (drops, laundering, vacuuming, combing) are working. Sticky paper is strong but easy to change, with pull tabs so you don't have to touch the creepy bugs. Better trap than what was offered in stores. We at first caught 30-40 per trap (used first in rooms where cats slept, and then under beds), but are now down to almost nothing. I'm keeping them going at night to alert us if fleas return. Definitely a useful tool in the battery against these pesky bugs.