Boorum & Pease : Columnar Book, 12 Column, Black Cover, 150 Pages, 10 3/8 x 8 1/8 -:- Sold as 2 Packs of - 1 - / - Total of 2 Each Smyth sewn for durability and a flatter writing surface. Premium white, acid-free paper. Permanent, waterproof inks. Unit ruled, numbered pages. Undated for flexibility.