The Joplin mid back classic design chairs by Woodstock are made exclusively from the highest quality products available, Starting at the bottom the generous 25"" base is made from hand polished aluminum, the casters are generously oversized 60 mm casters, The chrome frame is extremely high quality triple plated nickel chrome, The leather seat and mid back seat back are made with high quality Black Eco Leather, Added features include adjustable tilt tensions and tilt lock, These classic design chairs are built to a commercial level of quality and exceed BIFMA specifications, SKU: WDST005