Replacement Swivel Office Chair Wheels Casters Universal Fit Features: 1. Protect Your Floors: Each rolling chair wheel is encased in TPR soft rubber guaranteed not to scratch any surface. Quietly gliding over carpet, tile or hardwood without scratching, protect your floor. 2. Heavy Duty & Durable: Maximum weight rating: 130 lbs. EACH wheel. All internal parts made of superior grade steel make the caster wheel more durable, sturdy to use. 3.Smooth and Silent Rolling: With four ball bearings on each wheel, it can keep your chairs moving smoothly and quietly. No more squeaking and rattling. 4.Universal Fit & Easy Installation: 2 step assembly process, just take your old casters out and push your new ones in, and you are done Specifications: Material: Steel and TPR Rubber Wheel diameter: 50mm(Approx 2 inch) Stem Length: About 22mm (7/8 inch) Stem Diameter: Approx 10-11mm (7/16 inch) (Look at the picture) Color: Black Package Included: 1/3/6/9 Chair universal wheel Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.