Set: Mid-back mesh fabric office chair 360 Degree Swivel Color: Black Sponge: Primarily sponge Mesh fabric on back and seat Armrest: Nylon armrest Butterly mechanism Class 3 gas lift Foot material: 350mm nylon base with wheel All materials meet with BIFMA standard Product size: 19.29in length, 24.41in width, 34.65-38.38in height 17.91 - 21.65 Inches Adjustable Seat Height Seat Dimensions: 20.2in length, 19.5in length, 20in height 1pc/brown box size: 24.6x12x23.62 inches N.W./G.W.: 24.9 / 29.54 pounds