Swivel armchairs. Base with four spokes on feet in aluminum alloy, painted in the shades white or black. Sling with armrests of polypropylene reinforced with glass fibre, in the shades white or black. Seat cushion upholstered with self-extinguishing polyurethane foam. Removable cover of the seat cushion in fabric or leather. For the version 2273/R removable backrest cover in fabric or leather with Dacron Du Pont.