Which trim sizes are available?

5 x 8 in, 6 x 9 in, 7 x 10 in, 8.5 x 11 in and A4 (21 x 29.7 cm). Another trim size carves the mazes again to fill the new page (locked mazes stay). Children's books and large print work best at 8.5 x 11; 6 x 9 makes a pocket book.