Boss Executive CaressoftPlustm Chair with Metal Chrome Finish - Mid Back by Boss Office Products.Mid Back.Upholstered with ultra soft, durable and breathable Black CaressoftPlustm upholstery.Metal chrome plated arms topped with hard arm pads.Heavy duty 2 paddle spring tilt mechanism with infinite lock.Upright locking position.Pneumatic gas lift seat height adjustment.Adjustable tilt tension control.Large 27" chrome base for greater stability.Hooded double wheel casters.