Active ergonomic design allows user to fine tune comfort zones. Solid steel wire frame permits the seat and back to flex independently. Durable upholstery with stain-resistant protection. Arched five-point star base has dual-wheel casters for easy mobility. Casters supplied with this chair are not suitable for all floor types. Alternative casters are available to meet your specific needs. Chair Type: Rolling Chair; Folding/Stacking: N/A; Width: N/A; Depth: N/A.