3-Ring Binder by HaloDex, Black, 1.25" Rings HaloDex notebooks lay-flat & fold-back like spiral-bound notebooks and they allow pages to be added & removed like a ring binder HaloDex notebooks have the same hole-pattern used by all major day planner manufacturers, which means you can fill them with any brand of preprinted calendar and all types of accessories Also Available . . . HaloDex 8.5 x 11 Filler Paper, Cover Sets, Complete Notebooks & Accessories (All Sold Separately) Binder is designed for 8.5 x 11 paper in portrait orientation or 11 x 17 paper in landscape orientation Finally . . . an advancement in notebook technology worth noting!