1. **Important Note:** This gripper uses an "H" design, effectively gripping hard, smooth floors. It is not suitable for rugs on carpeted floors or for rugs with rubber, jute, or fluff backings. Please verify your rug's suitability. The adhesive surface becomes permanent once applied to the rug. 2. **Design Feature:** This product is easily affixed under any rug. The side facing the floor has small suction pores. These pores utilize the "H" design; when pressure is applied from above, air escapes, creating a low-pressure area within the cups. This generates an adhesive effect, keeping your rug in place. 3. **Advantages:** The rug anti-curling gripper is less than 1/10 inch thick and discreet after installation. Suction technology adheres firmly to the floor without leaving marks or causing damage, and the gripper is easily removable. It is convenient to clean, as you don't need to separate it from your carpet. The tape adds extra underfoot comfort due to the slightly bouncy nature of the suction technology. 4. **Components:** This package contains 8 pieces. Each gripper is 3.9 inches x 3.9 inches, with a square shape to maximize contact surface area with the floor. This enhances the safety of your kitchen, bathroom, and hallway. They can also be used outdoors to prevent slipping and flatten rug corners.