Furniture Stopper: our furniture cups adopt a square groove design, which fits the wheels more closely, prevents the wheels from sliding, and ensures stability; suitable to be used with most furniture wheel types. Protect Your Floors: the caster cups are made of plastic material, durable, anti scratch, anti noise and wear resistant; Perfect solution to protect your floors from damaging due to everyday use and movement of furniture. Unique Non slip Design: Electrostatic adsorption technology is used at the bottom of the furniture stopper, so that the furniture stopper is well anti slided on a wooden floor or a smooth surface. Wide Application: these furniture coasters can be widely used in home and office chairs, shelves, piano, sofa, bed frame,recliner, etc. One Second Installation: easy to install with no extra tools, just put the furniture wheels on the caster cups; After use, no longer worry about the wheels running around. Size Chart: 74x59x17mm/2.91x2.32x0.67inch Package Includes: Optional Package: 4 Pieces or 8 Pieces Furniture Caster Cups Note: 1. Please allow slightly error due to manual measurement. 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. 3. Wish you a wonderful online shopping!