This book 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. The book includes a removable backer for positioning under the blue sheet to prevent bleed through. Sets are consecutively numbered 1-100 The front covers is made from durable 20 pt white board, , and the back is 30 pt grey chipboard. The book is stapled and taped along the 11" side. There are 100 sets per book. Proudly made in USA!