Made of high-quality and environmentally friendly rubber, the door stopper is durable and will not damage the floor or leave marks. The grip is firm and will not harm the door. Suitable for door gaps between 5-30mm. For a stronger hold, use two door stops stacked together. The angled design helps prevent the door from closing on its own. Wide range of applications: The door stopper works effectively on various high-grip flooring surfaces such as wood, cement, vinyl, tile, and carpet. The thicker the floor material, the better the adhesion. Simply place it at the bottom of the doorno installation, tools, or adjustments required. Leaves no color residue or streaks. These rubber door wedges allow for easy movement between rooms at home, school, or the office without repeatedly opening and closing doors. Ideal for use on multiple interior doors. Note: Measurements are manually taken, so please allow 1-3 cm variation. Due to differences in lighting and display screens, colors may vary slightly from the images. Actual product received may differ slightly in appearance. Delivery quantity: As shown in the main product image.