The fortified construction and soft comfort of the black 6400 Series heavy-duty padded stools with backrests are ideal for hands-on educational settings like art rooms, science labs, home economics or shop classrooms. These reliable stools feature a sturdy frame of 18-gauge steel tubing securely welded to a 14 inch diameter seat pan. Riveted through the steel pan are .5 inch -thick black vinyl cushioning that will provide years of dependable use. Footrest ring is securely bonded to each leg with four spotwell contact points. Height-adjustable legs extend from 32 inches to 39 inch in 1-inch increments and adjustable padded backrests can be moved 2 inches up/down and forward/back.