This is a listing for four Full Round TubeTraps that measures 9″ in diameter and 30″ in height. Great for curbing an overzealous bass response in your room. The four you see here is specially ordered with two color finishes. So you can either use the black side or the grey side depending on your room finish. Cosmetically, they all look good with just minor scuff marks/stains from use. They are expensive to ship (due to their DIMS) so local pickup preferred (Queens, NY or Northvale in NJ).