What strokes will not fade with the expression of bobo ball?

Markerpen (English: Marker Pen or marker pen), also known as marker pen. It is a special drawing color pen for writing or painting, which contains ink itself, usually with a pen cover and a hard nib. The pigment of marker pen is volatile and can be used for quick drawing at one time. It is often used to design articles, advertising slogans, posters or other artistic creations. You can draw thick lines with little change. Box-head pen is a kind of marker pen. At present, marker pens are also divided into water-based and oil-based inks. Water-based ink is similar to colored pen, and contains no oil essence. Oily ink is more irritating and volatile because it contains oil essence. If the paint falls off the toy, you can use a marker to make up the color.