Steel 5-way spider frame (black semi-gloss powdercoat finish), castors 60mmDIA unhood twin wheel no brake, adjustable seat height 490mm-540mm, high density foam seat & back are fully upholstered with detailed stitching in either Warwick Gravity commercial grade fabric (steel, slate, cloud or navy) or commercial grade factory fabric (ash grey or blue), various other frame options available in this furniture range