The description for No. 15 and the obi fabric are the same. The lining also uses the same material. This is a case for a double-page spread goshuincho (temple stamp book). Outer dimensions: 27.5cm x 20cm Suitable goshuincho size: double-page spread goshuincho of approximately 18cm x 25cm. As the size of double-page spread goshuincho varies, please be sure to measure your own goshuincho before purchasing.