Known as blank painting core, blank scroll, blank painting axis, etc. There are different names, and the corresponding products can be found in Taobao. It is not economical to use this, and the effect of mounting rice paper is poor, which is manifested in the fact that the ink will not have the feeling of "seepage", the pen is a bit astringent, and each product will have different feelings. It is best to write a satisfactory one and then mount it. If calligraphy is very sophisticated, it is really convenient to use this method.