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。具雙桿式的氣壓及傾仰角度鎖定開關。有4段式剎車功能及安全回彈裝置與升降功能；另加坐墊滑動裝置，依個人之體型調整距離，滑動輕巧，吻合度高。

Synchronized mechanism for medium and large office chairs, backrest and seat tilt at a 2:1 ratio, ergonomic design, 2 levers for gas height adjustment and locking function, 4 locking positions, return-preventing system for backrest, tilting function, assembling with seat slider which can adjust the depth for seat.