Tea, cigarettes and wine are the biggest and most common gifts in China. Even if the leader himself doesn't drink tea, smoke or drink, he can still give this gift as a gift to others, because it is the most common gift in China.
Books, calligraphy and painting-this is a very elegant gift that most people will like or accept.
This is an artistic gift with great price flexibility. Therefore, it is often inconvenient to measure by price, which brings back a sense of mystery and quality to this gift. Especially for some leaders with poetic style, it is a very good way to show filial piety to send a pair of calligraphy and painting and two books.