Lab Notebook is ideal for use in labs and science classes. Smooth, green, 20 lb. writing paper is printed with 4 square/inch graph layout. Pages are consecutively numbered from 1 to 152. Covers are made from a flexible, red 10 point pressboard. Notebook is glued and taped along the 11-3/4" side. Sheets are not designed for removal from the book. Lab Notebook includes 76 sheets or 152 pages.