Cover color:

[Upgrade thick paper] dark 32K/50 books/50 sheets per book.

[Upgrade thick paper] light color 32K/50 books/50 sheets per book

[Upgrade thick paper] classic 32K/50 books/50 sheets per book

[Recommend] dark 32K/50 copies/50 copies each

Light color 32K/50 books/50 pieces per book.

Classic 32K/50 books/50 pieces per book.

Dark 32K/100 copies/20 copies each.

Classic 32K/100 Books/30 pieces per book.

Classic series B5/30 copies/60 copies each.

Classic big book A4/20 books/60 pieces per book.