These refill pages are for use in Porta-Pack® wire marker books, which are slim, lightweight, and easy to carry so you can always have the wire markers you need on hand. Each refill pack contains 10 pages, Brady B-500 Repositionable Vinyl Cloth holds tightly to surfaces but allows item to be repositioned with ease if necessary. Excellent flexibility for wrapping around curved surfaces. Withstands moderate heat, oil, water and dirt.