People not only write with pen. Other than writing, often we draw lines with pen. Most time people use ruler to draw a straight line or free hand which results winding line. This invention is regarding a method to draw straight line without using ruler. Normally, ball point pen freely rolls in accordance with a ball that located at the tip of pen. This device is to apply a controlling condition to a ball in order to rolls to only one direction. Letâ€™s draw a straight line with a ball that has restrained with directivity. With added ruling device feature, the length of line will be measurable. Even people can draw an exact length of straight line as desired. The total length of line will be indicated on the product by installed measuring wheel. The mounting area is made with a flexible rubber material to provide the best tightness. This product can draw horizontal and vertical lines in addition to 45 angled lines. By using this product, people can draw under lines, tables and desired length of straight lines.