Material: the Surface Material is Made of High-Tech Polyurethane, Which Isng and Durable, Which Can Ensure That the Chair Rolls Easily and Smoothly on the Floor Without Leaving Any Traces on the Floor. the Maximum Load Capacity is 150 Kg/330 Lbs. Standard Size: the Diameter of the Office Chairers is 50 Mm, the Installation Height is 60 Mm, the Diameter of the Stud is 11 Mm, and the Diameter of the Threaded Rod is 10 Mm, Which Makes Theseers Suitable for Most Office Chair Bases. Double-Wheel Design: the Thicker and Thicker Center Dragand Beamake Itnger, 360-Degree Rotation, Easy to Move, and the Material is Shockproof, Which Can Protect the Floor from Wear. Stylishers Make Your Chair Stand Out. Replacement Wheel: Designed to Fit All Standard Office and Computer Chairs. Easily Replace Olders, Upgrade Home or Office Chairs, and Change Your Decoration by Adding Cool. 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