Has 8 pieces steel ball bearings sit in individual hollows for smooth rotation and easy gliding Use this for revolving shelves in kitchen cabinets, planters, serving platters at the table, even large tabletops Convenient and multipurpose use, great for display collection of any arts or crafts, projects, etc. 360 degree fully rotating surface, you can manually adjust the displayed goods Made from solid plastic that guarantees no rust or oxidation