This is our high quality active learning stool, which is perfect for individual or group learning. The non-slip, curved base allows for movement in all directions while seated. The backless design encourages good posture and can also strengthen core muscles. The PP material makes it easy to clean. The height of wobble stool is adjustable that you can adjust it from 16.5" to 24" according to your need, which makes it ideal for room with student of every age. What''s more, the stool is lightweight so that you can move and store it conveniently. This chair can add vitality to your study or work life. - Brand new and high quality- Anti skid design, the cushion and bottom cover are made of silicone material- Backless design encourages proper posture while strengthening core muscles- Lightweight design for easy mobility and storage- Convex base allows for movement in all directions while seated- The surface is smooth and easy to clean- Can be used in office, library or home- No assembly requiredColor: BlackMaterial: PP and siliconeProduct size: 13" x 13" x 16.5"-24" (L x W x H)Weight capacity: 220 lbsNet weight: 10 lbsPackage includes:1 x Black wobble chair1 x Instruction