This quality extended height lab chair covers the basic for long hours at task. The Highland features one-touch, pneumatic seat height control and spring-action height adjustment and depth adjustment along with a deep contoured seat cushion. A 5-wheel caster base allows freedom of movement and the chrome-plated adjustable footrest furthers seated comfort. Features: Lab Chair features sturdy steel frame construction with 5-wheel caster base Lab Chair features auto seat height adjustment and height and depth adjustment Black finish Contoured seat with waterfall seat edge 360 Swivel Upholstery: 30% Polyester,70% Olefin Adjustable chrome foot ring Weight Capacity: 250 lbs Assembly required Specifications: Seat Size: 18.5" W x 17" D Back Size: 16" H x 15.25" W Seat Height: 19" to 27" Base Size: 25" diameter Dimensions: 19" to 27" H x 25" W x 25" D Meets or exceeds ANSI,BIFMA standards. The American National Standards Institute (ANSI) and the Business and Institutional Furniture Manufacturer's Association (BIFMA) work together to produce voluntary standards that provide a common basis for evaluation of product safety, durability and structural adequacy. Greenguard approved. As an industry leader, Safco aims to set high environmental standards offering a large collection of GREENGUARD Indoor Air Quality Certified products and GREENGUARD Children and Schools Certified products. The GREENGUARD Certification Program is internationally recognized for evaluating product emissions and certifying building materials, furnishings, finishes, and cleaning products and processes that meet stringent indoor air quality criteria defined by GEI.