Protext Premium books contain premium quality 70gsm white bond paper with clear polypropylene Protext covers, no book cover required, to ensure your books last all year. Colour coding is red for ruled, green for graph and blue for plain pages. Every book has its own reference, E is for exercise book. Other features include a 4 year calendar, activity page, maths tables and conversion charts. Replaces the discontinued Candida range.