The most obvious is shock resistance. After installing it on the door stop line, it reduces (or even disappears) the collision noise when closing the door (window), protects the edge of the door leaf, extends the life of the door, and reduces noise. The second is sealing, damping, and isolating indoor and outdoor air, which effectively plays a role of heat preservation and energy saving, and will prevent small insects such as mosquitoes from getting into the room. Slotted sealing strip is a slot in the door frame to install the sealing strip. This slotted seal makes the sealing strip embedded in the groove difficult to fall off and easy to install.