Vinyl HELPS KEEP KIDS ACTIVE. Runtz Ball Chair helps keep kids active while encouraging better posture and balance. Use Runtz in classrooms, waiting areas, schools, daycares, lobbies or any space with small-sized guests. CPSIA Compliant. PART CHAIR, PART BALL. Designed with four powder coated legs and an anti-burst exercise ball for stability and durability, Runtz offers the bouncing benefits of a yoga ball without the rolling around. CHOOSE YOUR ALTITUDE. Each Runtz ball chair lets you select one of two heights by installing just the feet for a sitting height of 13.5" or both the legs and the feet for a sitting height of 17" both options are included. GREENGUARD Certified products are scientifically proven to meet some of the world's most rigorous, third-party chemical emissions standards, helping reduce indoor air pollution and the risk of chemical exposure to help create healthier indoor environments No assembly required