These are business cards made from Tozan Washi, a traditional Japanese paper preserved for over 800 years in Tozan Town, Ichinoseki City, Iwate Prefecture. According to historical accounts, survivors of the Fujiwara clan from Hiraizumi, fleeing the Kamakura conquest in the late Heian period, settled in the area and began making paper for daily use alongside farming.

Made from kōzo (paper mulberry) fibers, kōzo paper is extremely durable and has long been used for official documents, sutras, and books that require long-term preservation, making it a hallmark of Japanese traditional paper. The natural color of the kōzo gives the cards a simple yet sturdy aesthetic. The 50-card boxed set also reflects this rustic elegance. It is said that Matsuo Bashō’s travelogue Oku no Hosomichi was written on Tozan Washi cut into quarters, highlighting its historical significance.