Check the listing for details. Office Chair Caster Wheels Replacement Set Of 5 Plastic New Open Box Mainstay. Color: Black, Condition: Open box. Listed at 5.99 USD. Upgrade your office chair with this set of five replacement caster wheels from Mainstay. Designed for versatility and durability, the wheels are perfect for those looking to refresh their seating setup or for replacing worn-out components. Crafted from sturdy plastic, these caster wheels promise a smooth glide across various surfaces, making them ideal for both home and office use. The modern black color integrates seamlessly with most office chairs, maintaining a sleek and professional aesthetic. Each wheel stands at a height of 2.5 inches, providing a comfortable and supportive sitting experience. The package includes five wheels, ensuring you have plenty for all your chairs or for future replacements. Keep your workspace running smoothly with this practical and stylish accessory.