The Miyamotos makes the paper from their own cultivated Kozo and Tororoaoi. The raw Kozo material is bleached using heavy snow around the house. Because of the high quality and stable reliability of their paper, it was used for the restoration for various important constructions, including “Katsura Rikyu Imperial Villa (桂離宮)” in Kyoto. They named the paper “Yukyu-shi (悠久紙)”, which means "Eternal paper", with their wish.