Perfect Complement To Ecr4kids Resin And Adjustable Activity Tables, This Colorful Stool Provides Versatile Seating Options For Work Or Play. With Its Special Ace (Active Core Engagement) Design, The Stool Encourages Proper Posture While Strengthening Core Muscles. Children Can Rock 360 Degrees To Work Out Their Wiggles With The Innovative Design That Is Tip-Resistant. The Lightweight Polypropylene Stool With A 20" Seat Height Comes Fully Assembled. It Meets Or Exceeds All Applicable Test Requirements From Ansi/Bifma X6.1-2012 American National Standard For Office And Institutional Furnishings - Educational Seating - Tests. Stool Is Recommended For Children From 12 Years Old And Up..