How many grams is the most beautiful China hard-pen calligraphy book?

The most beautiful China calligraphy book is100g. Practicing hard pen calligraphy can form the habit of being serious, careful and observing. Using Tian Zi lattice can exercise the author's eyesight and observation. Because Tian Zige is a square, 90 degrees is straight. The diagonal of Mi Zige is 45 degrees, and many strokes of hard pen are 45 degrees. The diagonal of Mi Zige is 45 degrees, so people who practice calligraphy can write along the rice noodle without observation and eyesight, so people who practice calligraphy can't really exercise observation and eyesight.