The BB Series 4000 consists of 14 double slat elements, you can achieve an individual pressure distribution with the 6-fold hardness adjustment in the pelvic area, this is additionally supported by the flexible, internal rubber caps. The slats are milled in the shoulder comfort zone and, therefore, have greater flexibility there. There are three variants in the collection: a rigid slatted frame, one that has manually adjustable head and foot areas and one with motorised adjustment.