The most obvious is shockproof. After installing it on the door stop line, it reduces (or even disappears) the collision sound when closing the door (window), plays a protective role on the edge of the door leaf, and extends the life of the door and reduces the noise. The second is sealing, shock absorption, and isolation of indoor and outdoor air, which effectively plays a role in heat preservation and energy saving, and will prevent small insects such as mosquitoes from drilling into the room. Slotted sealing strip is to open a slot on the door frame and install the sealing strip. This slotted seal makes the sealing strip not easy to fall off when inserted into the groove, and is easy to install.