Duraspring System. Soft Feel. Fibre Fillings. The Quattro divan set is from Airsprungs gently supportive range it contains the duraspring spring system which is a 13.5 guage spring system which is made with high tensile wire therefore giving an increased performance. The Quattro divan by Airsprung has a softer flexible surface offering comfort & support for a good nights sleep. The base comes as a platform top & is available with many drawer options.