The walls of my apartment here are made of thick sound absorbing concrete. Almost no noise leaks into the neighboring unit. The doors to the hallway are a different story. 1" tape is wide enough to seal a metal door. Tips for other buyers: If you are concerned about not being able to stick the tape 100% straight and parallel to the door jamb, you can cut the long tape into several segments to attach it can also help you avoid installing in the wrong place and repeating the work, which may cause the tape will not stick.Adhesive base clean and high quality.I follow the seller's instructions, clean and dry the surface, and press tight to seal it tightly, the result is excellent, it does not affect the opening and closing of the door, so the thickness suited me, I think the density helps, because right after it seems like it makes a difference by it reduces the noise Thank you!
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