Choose the Duo Book by Clairefontaine, an innovative notebook offering both 80 pages of small squares and 80 lined pages to meet all your professional needs. This full binding A4+ notebook is designed with a robust spiral for easy and durable use. The Duo Book stands out for its versatility: each type of ruling is identified by a colored band, making it easy to navigate between the 5x5 squared and lined sections. Additionally, this notebook is reversible and can be used from both sides, front or back, according to your preference. The sheets of this notebook are detachable, micro-perforated, and 4-hole punched, allowing you to easily integrate them into a binder. The Clairefontaine Vélin Velouté 90g paper provides an unparalleled glide feel for smooth and enjoyable writing. Designed and made in France with a strong commitment to the environment, the Duo Book is PEFC certified for sustainable forest management. The Clairefontaine brand, known for quality notebooks since 1950, uses paper pulp sourced 100% from forests certified for environmental management. Adopt the Clairefontaine Duo Book for a high-performing and ecological work tool, with dynamic blue and red colors. Manufacturer's reference: 82526C. Format in cm (W x H): 22.5 x 29.7.