Rotate Twin Wheel Caster for Office Chair, 2-Inch Nylon & PU M10X15mm Threaded Stem Swivel Black & White Caster Wheels - China Rotate Twin Wheel Caster, Office Chair Caster | Made-in-China.com
Safety Casters, Oversized Neck, Grip Ring Type B Stem, 2" Soft Polyurethane Wheel, Matte Black, 5/Set - Pointer Office Products
Amazon.com: Slipstick CB682 2 Inch Replacement Office Chair Wheels (Set of 5 Casters) Universal Standard Size Stem 7/16 Inch x 7/8 Inch - Black Plastic : Office Products