Furniture Stopper: Our furniture cups feature a square groove design that fits wheels more securely, helps prevent sliding, and enhances stability; compatible with most furniture wheel types. Protect Your Floors: The caster cups are made of durable plastic material, providing scratch resistance, noise reduction, and wear resistance; 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, helping to reduce slipping on wooden or smooth surfaces. 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 furniture wheels into the caster cups; helps keep wheels in place during use. Size: 74x59x17mm / 2.91x2.32x0.67 inch Package Includes: 4 Pieces 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 color may vary slightly from the image.