The National Public Seating Z Stool With Backrest is a sleek addition to any studio or lab. The wide base and rear brace provide plenty of stability. Its unique design lets you nest the stool on tabletops and desks, making it easy to clean up after class. The blow-molded backrest has holes for airflow. Polyurethane glides protect your floors. Select from three seat heights; 22-inch- and 24-inch- height stools feature a steel foot ring.