1x1mm blue pin-graph paper, original to Postalco, which is then bound in a starch-pressed cotton cover. The cotton is treated to make it water repellent, ready for brief, light spills. It will gradually fade with age, the texture of the weave becoming more noticeable. The spiral binding allows the pad to lie completely flat for ease of writing. Postalco have produced these since 2004. Made in Japan.