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These devices work well, however, don't remember how many I've forgotten to remove after use and subsequently dropped on the track, freeway ect.
Yea, you kinda have to remember to take them out. On that note, when they are made from urethane and they come out going down the road at least something soft hits your car. It might leave a rubber scuff that will buff out rather than a dent because of a harder material like some of the others out there.