The Premier Office Chair Caster Wheels PU Large 60mm (2.5") Black & Chrome. - Standard Size wheel will fit most chairs. Quiet & Smooth! The Best Quality Guaranteed! QUALITY!!! MATERIALS & SERVICE: Made with high quality hard plastic. Guaranteed for 5 years. As a small business we are able to deliver superior quality products & customer support than our competitors. You're in safe hands. ENVIRONMENTALLY FRIENDLY MATERIALS: Other casters usually made with cheap material (usually PVC, it's not eco-friendly material, after short time usage, the material will peel and come off. GUARANTEED TO LAST: Made with High Quality Steel and Hard Plastic. Each Wheel can hold up to 110lbs, (550lbs total with 5 wheels.) STYLISH OVERSIZED WHEEL, GREAT FOR CARPET: Sophisticated Design, 60mm (2.5") Wheel. Great for use on Carpet. Casters have a wider base that makes it Glide with Ease. If you have carpet, stay away from narrow base casters, they will sink into the pad and will be hard to maneuver.