(set of 5) heavy-duty 3" professional replacement caster wheels for office chair - rubber rollerblade style casters for hardwood tile or any hard-flooring - holds up to 650 lbs - protect your floors mod complete *meant for use on hard-floors. do not use on thick, shaggy, or high carpeting. safe to use on standard office carpet. **the wheels will hold up to 135 pounds each (totaling 650lbs), check to see the weight your chair can hold before use as most chairs only hold up to 300lbs.