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. Front cover is water-resistant 20 pt pressguard, and the back cover is a heavy 50 pt chipboard. Spiral bound along the 11″ side, and the wire ends are coil-locked for snag-proof performance. Includes a double pocket under the front cover for storage of loose papers. There are 100 sets per book.