Do you want to always have a ruler on hand for your daily study routine? The Smart Notebook ruler is the ideal accessory to make your notes and drawings even more practical and organized. At 18 cm long and with smart perforations, it fits directly onto the discs of your notebook, always staying with you and ready to use when you need it. Easy to remove and replace, it adapts perfectly to your study rhythm, without complications. It is compatible with Large, A5 and Medium sizes, ensuring greater functionality in your Smart Notebook.