Amazon.com: TICONN Office Chair Caster Wheels Set of 5 for Tile, Hardwood Floors and Carpets, Universal Fit for Most Chairs (Black) : Office Products
PHT5558BK (5 pack) - 5-Pack Replacement Chair Casters with 1.5" Barrell and 7/16" Grip Ring
Amazon.com: 2 Inch Office Chair Caster Wheels Replacement Set of 5 Floor Protecting Smooth Rolling Heavy Duty Computer Gaming Desk Universal Fit Standard Size Black : Office Products