Barter is the present and the future of international trade, especially for people who is starting in the import export business. Barter and more: Triangular operations.
The other is the effect of noise reduction. The noise will enter the room through the gap of the door gap, and it will affect our sleep at night. At this time, the brush installed under the door can play a role of sound insulation. It is not as good as sound insulation equipment, but it can effectively reduce noise.