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 furniture wheel types. Protect Your Floors: Caster cups are made of durable plastic material, providing scratch resistance, noise reduction, and wear resistance. An ideal solution to protect floors from damage caused by daily movement of furniture. Non-Slip Design: The bottom of the furniture stopper uses electrostatic adsorption technology, offering reliable grip on wooden floors and smooth surfaces to help prevent slipping. Wide Application: These furniture coasters can be used with chairs, shelves, pianos, sofas, bed frames, recliners, and other furniture in home or office settings. Easy Installation: No tools required. Simply place furniture wheels onto the caster cups for instant setup. Helps keep wheels in place and prevents 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 variation due to manual measurement. 2. Due to differences in monitor displays, the actual product color may vary slightly from images shown.