Furniture Stopper: Our furniture cups feature a square groove design that fits wheels more securely, helps prevent sliding, and enhances stability. Suitable for use with most types of furniture wheels. Protect Your Floors: Caster cups are made of durable plastic material, resistant to scratches, noise, and wear. Ideal for protecting floors from damage caused by daily movement of furniture. Unique Non-Slip Design: The bottom of the furniture stopper uses electrostatic adsorption technology, providing reliable grip on wooden or smooth surfaces to prevent slipping. Wide Application: These furniture coasters are suitable for use with chairs, shelves, pianos, sofas, bed frames, recliners, and other furniture in home or office settings. One-Second Installation: Easy to install without tools—simply place the furniture wheels onto the caster cups. Quickly secure wheels and eliminate unwanted movement. Size: 74x59x17mm / 2.91x2.32x0.67 inch Package Includes: 4 or 8 Pieces Furniture Caster Cups (optional) Note: 1. Please allow slight measurement deviation due to manual measuring. 2. Due to monitor display differences, the actual product color may vary slightly from the images.