Multipurpose chairs with mechanism-free synchronised movement of seat and backrest in proportion to the user's weight. Available also in the "Large" version with larger seat dimension. A tested programme of multi-functional seats, qualified by outstanding ergonomics together with great strength and long duration. The chair is equipped with Sincrolamm synchronous movement, which adjusts the seat and backrest inclination according to the person's weight, in order to ensure ergonomic posture all the time and the utmost comfort in all positions. A1000 is available in different types with or without arms, with a four-leg base, with a five-star swivel base on castors or skids and on beam, in addition to the A1000 Large model which is particularly comfortable and larger in size. The wide range of accessories allows use in different places: office, conference and community.