It contains 4 swivel casters for easy mobility , 2 lockable for safety stability , so that it can be easily rolled from room to room. The castors are well constructed, durable, and they will not leave scuff marks on polished wooden floors. It utilizes an environmenttal-friendly Steel Powder Coating on its surface, which is non-toxic, harmless and odorless, and offers addtional benefits, such as protection against rust and corrosion, allowing extended use and easy cleaning.