You may be asking yourself exactly what the difference is amongst 3D and 4D arms. 3D arms Use a static condition, when 4D arms are adjustable. This suggests they may be moved up and down, forward and backward, or in some other mix of movement for optimum ease and comfort. https://emilianoumdtl.gynoblog.com/33455518/the-ultimate-guide-to-racing-style-gaming-chair