LETTER-SIZED REFILLS - Letter size refills paper has 11 discbound holes suitable for ring binder, discbound notebook or planner inserts. A4 loose leaf paper compatible with Filofax Organizers & Clipbook, TUL, Staples ARC, Franklin Covey, Levenger Circa, Talia, Happy Planner, and other half-letter size 11-disc notebook and planners. LINED REFILL PAPER - 8.5" x 11" refill line paper, With the line spacing of 0.27 inches/7mm, double side clear black lines, Conveniently record your work and study. Prepunched filler paper, no hole punch required. PREMIUM PAPER - Filler paper is made of 100gsm premium white paper for smooth writing, and heavy-weight, acid-free paper to avoid ink bleed through. Suitable for fountain pen, gel pen, roller pen, ballpoint pen, highlighter, pencil, neutrals and etc. All pens write smoothly on the lined paper refill.