Wobble Stool: Adjustable wobble stool with a cushion top for added comfort; backless design encourages the development of proper posture and helps strengthen core muscles Flexible Seating: Quickly rearrange workspaces, creating dynamic classroom environments, promoting teamwork and collaboration; use as a desk chair, office chair or circle up for discussion Lightweight and Portable: Durable plastic chairs are lightweight making it easy to inspire learning in any environment; add movement throughout the day while making seated tasks more engaging Certified Safe: UL GREENGUARD Gold Certified for low VOCs, CPSIA compliant, and meets the requirements of ANSI/BIFMA X6.1 Educational Seating sections 8 and 10 Product Dimensions: Alternative seating measures 13.3″ L × 13.3″ W × 17.7”-23.6” H and arrives fully assembled and ready to use; Adult Active Engaged & Direct Supervision Required