The Modus 275/7 swivel chair by Wilkhahn has a synchronous automatic mechanism, i.e. the seat and backrest tilt adjust themselves to every sitting position of the user. If the user leans back, the supporting spring force increases proportionally. The spring hardness is infinitely variable. The front position can be changed by pressing a button. The seat height adjustment by gas pressure. The material is black dyed polypropylene. The seat is equipped with exchangeable cushions. The back has an exchangeable frame cover made of black polyamide fabric: closed or transparent. The seat height is always between 42 and 53 cm. Three backrest heights are available.