50 screw column 3 adjustments on choice: -permanent contact -traditional sincron -sincron "plus", with personalized adjustment of sit/back angle		asynchronous 3 adjustments on choice: -permanent contact -traditional sincron -sincron "plus", with personalized adjustment of sit/back angle
	gas-lift column Sitting device and the back of chair evolve together under the best ergonomic angle between belly and legs. Intensity adjustable devices according to your weight. Possibilities of fixed positions.		synchronous Sitting device and the back of chair evolve together under the best ergonomic angle between belly and legs. Intensity adjustable devices according to your weight. Possibilities of fixed positions.
	tip-up The chair tips-up backwards for a relaxing position.		tip-up The chair tips-up backwards for a relaxing position.
	elastic joint The back of the chair bend's following movement of the back sustaining it. Can be fixed in diferent positions.		permanent contact The back of the chair bend's following movement of the back sustaining it. Can be fixed in diferent positions.
	anti-shock device The back of the chair bend's following movement of the back sustaining it. Can be fixed in diferent positions.		weight-adjusting device The back of the chair bend's following movement of the back sustaining it. Can be fixed in diferent positions.
	up-down arms The back of the chair bend's following movement of the back sustaining it. Can be fixed in diferent positions.		up-down device The back of the chair bend's following movement of the back sustaining it. Can be fixed in diferent positions.