Easy to Write（Reddot）
Stretchable spine changes the traditional binding method of books,
which makes the edge of books to form smooth gradient.
As a result, it is more comfortable to write
and more convenient to flip over.
Stretchable spine changes the traditional binding method of books,
which makes the edge of books to form smooth gradient.
As a result, it is more comfortable to write
and more convenient to flip over.