01 Berkshire leather Pigskin 02 Calfskin 03 French Morocco Calf split or sheep split 04 Morocco Goatskin 05 Bonded buffalo grain 06 Bonded calf grain 07 Bonded Cordova 08 Bonded eelskin 09 Bonded Ostraleg 10 Bonded ostrich 11 Bonded reptile grain 12 Bonded leather 13 Cowhide 14 Eelskin 15 Kivar 16 Leatherflex 17 Moleskin 18 Softhide leather 19 Metal 20 Velvet German 'Samt' 21 Mother-of-pearl Spanish 'nácar' 22 Papyrus 23 Géltex An imitation cloth binding material 24 Guaflex An imitation leather binding material