A7 and A7 Plus sewing wheels are the most technologically advanced sewing machines in the sewing industry. In addition to good features, this series of sewing machines of the Jack company: closed cartel, symbolic embroidery, automatic threading, digital sewing step adjustment, etc., also have the possibility of controlling the movements of the sewing machine for sewing fabrics of different materials. They also have the ability to automatically adapt the machine according to the material of the fabric, which means the user adjusts the device's rotational movement and height according to the thickness and material of the fabric in 4 modes: normal, elastic, fine and thick. And the positive point is that there is no need for mechanical adjustments of the sewing machine. Also, during sewing, events such as missing a stitch, changing the sewing step, and breaking the needle do not occur. This feature has made Jack consider the slogan of a wheel for all seasons for the A7 and A7 Plus sewing order, but the A7 Plus has another feature compared to the A7. It is also very useful in large factories and workshops.