The signature pen is an ordinary pen, which produces water evenly, and the handwriting is much more coherent than the oily pen (provided that it is used to it). Compared with ordinary pens, artistic pens are elbow tips, which can be used at 270 degrees (ordinary pens can only be used on one side). The water output varies according to where you use it. If you use it like an ordinary pen, it will produce a lot of water, and conversely, it will produce thin lines, so art pens are generally used for drawing and are not suitable for signing.