˙ This office chair has the comfortable chairback wrap to be possible taking down easily, by facilitates momentarily may let the user roll the stimulation back by the pellet hoop chairback, after or movement, replies the office chair condition.
˙ The chair may extend the design to be possible to let the user also be possible to take advantage of the function chair in the long-firing operation to let body's whole body physique like make gymnastics to stretch.
˙ The active chairback may 360 degrees high and low turn over, be possible to achieve the varying degree the massage function (to have like in Thai type massage extrados to brace function) .
˙ Massage effect! The granulated hoop chairback, may roll the stimulation back! Achieves the adjustment to relax with inspires the spiritual the effect.
˙ The foundation may adjust the fixed condition, may also depend on individual body weight the different adjustment loose and tight different swinging condition.