This is a new prop for me this year. I am going to have a blackout area about 12 to 16 feet long in my maze, with different lengths of clothe hanging down. This will be mixed in to with the clothe. I will use either a mat switch or motion sensor to activate it right after they get just past the first one. I started with 3 but Have decided to ad 2 more. They don't hurt but make you feel like a tick is crawling on you. I run about 25lbs of air through them.