BodyBilt's Drafting Chairs deliver maximum ergonomic function and comfort at a high work surface. The mid-back provides exceptional lower back support. 10-Point Posture Control adjustability puts at your command the tools to address and alleviate stressful aches and pains so often escalated by inferior chairs. The J Series mechanism rocks from a center-pivot point under the seat, combined with the back angle adjustment functions to create an Open Posture position.