Simple and generous. Leather book binding is to protect the book mouth, because the paper of the book is very fragile, and the tough and wearable leather wrapped outside the book can protect the book well, so the design of leather book binding is very simple and generous, without too much decoration. The binding of leather books is very difficult, and the operation requirements are very detailed, but the price is often relatively low, which makes it difficult to bear the high binding cost; Moreover, readers often carry these personal books with them and use them frequently. The book mouth is easy to wear and curl and needs special protection.