Lab Notebook is ideal for use in labs and science classes. The carbonless paper has a white original sheet and blue copy sheet. Both sheets are printed with 4 square/inch graph layout. Notebook includes a removable backer for positioning under the blue sheet to prevent bleed-through. Sets are consecutively numbered. Front covers are made from durable. 20 point, white board, and the back is made of 30 point, gray chipboard. Stapled and taped binding is along the 11" side.