INVISIBLE AND PRACTICAL: The base height is 3.5mm, which is thin enough to prevent kicking and tripping. Invisible design, and it will not destroy the overall beauty of the door after installation. It is suitable for doors with a door gap height of 3.5-12mm. The smaller the gap between the door and the floor, the stronger the magnetic force. (Please check the distance between the door and the floor before ordering.) SUPER STRONG MAGNETISM: The working principle of this door stop is that the powerful magnet on the door stop can firmly adsorb the door panel to hold the door open. It prevents the door from closing suddenly, plays a buffering role, prevents damage to the door, handles, and walls, and extends the service life. HIGH-QUALITY MATERIALS: This invisible and powerful magnetic door stopper is made of high-quality zinc alloy, which is wear-resistant, rust-proof, and waterproof, sturdy and reliable. It is durable, requires little maintenance, is corrosion-resistant, and waterproof,