These height-adjustable chairs are designed for little ones comfort. Their ergonomic shape create a pleasant place to sit for long periods of time. The backrest and seat made of profiled, varnished beech plywood. Flexible seating allows them to wobble, rock, bounce, lean or stand, which increases oxygen flow to the brain, blood flow and core strength. Also helps keep young minds more alert and focusedPerfect for early learning centers, classrooms or waiting rooms. Chairs are durable and stable due to the heavy-duty steel structure. Height adjustable for two different age groups make them versatile. The legs have plastic caps that allows one to place the chair on the table without rick of scratching the top.