These Monarch drafting height 25½" to 30½" chairs are designed for style and comfort. The chairs construction has contoured cushions and ergonomic features that make it an outstanding value. The high backrest provides solid orthopedic spine support and full-size upholstered seat is contoured for added comfort. The chairs features include pneumatic height control polypropylene seat and back shells, a height- and depth-adjustable backrest with tilt-angle control, adjustable seat pitch, dual-wheel casters, and a 23" diameter reinforced nylon base. They have seat cushion that are 19"w x 18"d x 3" thick & backrest 16"w x 19"h x 3" thick.