中大型椅適用之新孔機構，椅背和坐墊傾仰比例為2:1，符合人體工學，線控式的操作開關，有4段式剎車功能及安全回彈裝置與升降功能。

Synchronized mechanism for medium and large office chairs, backrest and seat tilt at a 2:1 ratio, ergonomic design. Cable handles easily attached to the mechanism. 4 locking positions, return-preventing system for backrest and height adjustment.