Premium High Quality Bright Heavyweight Paper - 90gsm Junior Size (5.5in x 8.5in)/Midsize (7.5in x 9.75in)/Letter Size (8.5in x 11in) Compatible with most discbound notebooks including Talia, ARC, Tul, Circa, Letter Size Happy Planner ONLY (Midsize does not fit Happy Planner Medium Classic) Talia reinvents the notebook - organization made fun and easy! Check out Talia's selection of additional notebooks, discs, refills, covers and accessories! Premium High Quality Bright Heavyweight Paper - 90gsm Junior Size (5.5in x 8.5in)/Midsize (7.5in x 9.75in)/Letter Size (8.5in x 11in) Compatible with most discbound notebooks including Talia, ARC, Tul, Circa, Letter Size Happy Planner ONLY (Midsize does not fit Happy Planner Medium Classic) Talia reinvents the notebook - organization made fun and easy! Check out Talia's selection of additional notebooks, discs, refills, covers and accessories!