Spirax #5650400 Carbonless P504 Cash Receipt Book Quarto Black Polypropylene Cover 50 Duplicate Sets Spirax business books are ideal for use by small and medium size businesses. Bound with a sturdy black wire which provides a clean and neat product. Sturdy and professional black polypropylene cover. From traditional note books to business books, subject books, lecture books, graph & music books, Spirax note books are ideal for use at the office, at home and at school. For over 85 years the Spirax brand is synonymous for its consistent premium quality; setting a benchmark as the market leader within the cardboard note book category. Spirax has five core categories and approximately 100 products; there is a note book to suit every need from everyday, education, business and personal use. Spirax is continually developing innovative products within the note book category which continue to keep the market relevant to our consumers ever changing needs.