1.Reproducing Contours: This precise contour knife is suitable for reproducing irregular shapes in all types of ceramics, molds, woodworking, flooring, carpet cutting, etc. 2 . Ease of Use: The pen is inserted and secured by adjusting the strength of the gold knob. Use the roulette or nib to draw the outlines of the object, while the pencil can simultaneously draw the same outlines on paper or any object. 3. Both Ends Design: The knurled end, featuring a high quality bearing, is suitable for drawing smooth and curved shapes, while the tip is suitable for drawing more complex angles and lines. 4 .Convenient Design: The position of the pen can be moved to either end, allowing you to change the way you draw at will, for intricate lines, working with no speed limit! 5 . High Quality and Long Lifespan: This contour blade is made of high quality metal with abs material, which is sturdy and durable. The high quality roller bearing shaft is smooth, wear resistant and stainless.