Wulff Net - Stereonet This hemisphere graph is a perfect tool for those who want to practice their skills of plotting, manipulating and interpreting geological data.Cover Great tough matte paperback. Secure professional binding prevents the paper falling apart. Therefore, the Notebook is durable to withstand any adventure Dimensions Measures 8.5 x 11 inches. Close To A4 Size but shorter in height. It is easy to squeeze it into a bag and perfect size to carry with you anywhere!Interior Details This amazing Notebook has 100 pages with thick, high-quality white paper to prevent ink leakage. The lines are in clear light grey which is visible and easy to follow. Only one stereonet on each page makes it more spacious to illustrate the vast data Suitable for pencils, pens, felt tips pens and acrylic pens. Simple design interiorWho will need this book? No matter you are a student, amateur or professional in geology field, this stereonet is required!!