Challenge duplicate books Featuring carbonless paper for consistent copy quality throughout the book, with no need for messy carbon Strong twin-wire binding allows pages to fold back or lay flat for ease of use Microperforated top copy for easy removal with a clean edge Colour-coded pages for easy identification of original records and copies Sequentially numbered in sets 1-50 for accurate record-keeping, easy referencing and accounting Size: 210x130mm Ruled pages Packed 5