Miquelrius Single Subject Spiral Notebook, Graph/Quad Pages, Blue, 80 Sheets (8.5" x 11") Large 1-Subject notebook; 160 pages (80 sheets in one color) micoperforated pages for easy detachment Extra opaque 70gr/m2 paper; 5mm graph squares; header for titles Micoperforated pages for easy detachment; hole-punched for filing Opaque polypropylene basic cover Coil binding which allows the notebook to be opened flat and to make 180 degree turn