Color: anti-static PU leather, Two colors, i.e. blue and black, are available. Dimension: ∮360mm (chair seat) Height adjustable between about 440-600mm (supplied with 160mm adjustable pneumatic rod) Surface resistance: 103~106Ω or 106~109Ω. System resistance:≤109Ω Specification: steel chroming five-star-foot; high strength and durable nylon castor; conductive metal chain