Designed With Tear-Off Top Sheets And Attractive, Durable Permanent Covers. Notebook Made With 20# Special Smooth Finish Bond Paper. Twin Wire Binding With Perforated Premium Heavyweight Sheets. Ruled With Margin. Extra Thick, Stiff Back Provides A Sturdy Writing Surface. Notebook Lays Flat When Open For Easy Notetaking. Perforated Sheets For Clean Tear Out.