This 11 disc line refill size of 8.5" x 11" , Letter Size 100 sheets/200 pages for 200 days, improve your productivity with this daily organizer. Loose leaf lined paper for compatible with Staples Arc, Talia, Levenger, Happy Planner, and other 11 discs letter size discbound notebooks. Refill paper is used to high quality 100gsm pure white premium acid-free paper, so you can confidently use most pens, pencils, and markers without ghosting and bleed-through. This refill line paper for school notes, meeting notes, or any form of writing, our Ruled Sheets have subtle gray lines spaced by a quarter inch.