Guaranteed for up to three years, this device has adjustable fittings which move couch sections for better comfort. Depending on style, foam density will be between 20 and 45 kilograms and foam thickness will be between 5 to 7 mm. Standard features include breather holes and EC compliant, fire-retardant, Class M2 faux leather. Some models include a paper-roll holder or a table leveler. Other varieties do not. Metal tables which are stationary include epoxy-coated steel frames heated to 250ºC for a polished finish. There are collapsible legs on some styles of metal tables but this is not a standard feature.