Universalers: the Silenters Are Made of High-Strength Plastic + Metal, with High Mechanical Strength, Non-Slip, Wear-Resistant, Non-Marking, Simple and Generous in Appearance, Beautiful and Practical. Features: Double-Channel Design, Uniform Force, Durable. the Wheeled Plastic Rotating Doubleers Can Change the Direction and Adapt to Your Movement, Can Rotate 360 Degrees, Rotate Flexibly, and Move Smoothly. the Wheel Surface is Widened, Running Smoothly Without Skidding. Floor Protection: While Protecting the Floor, It Obtains Smooth, Quiet Rolling and Full Rotation. Eliminates the Need to Use Floor Mats on Beautiful Floors. Heavy Load and Durability: the Design of Flat Doubleers is 5 Pcs/1 Set, Which Can Hold up to 125 Kg (Single Wheel Load 25 Kg). It is Very Suitable As a Replacementer for Home or Office Chairs with Hard, Noisy, Rough Plastic Wheels. Easy Installation: Designed for Quick and Simple Installation, Theseor Wheels Offer Long-Term Durability, Ensuthey Stay Securely Attached and Perform Smoothly over Time., Manufacturer: CHAOUYYZ