Introducing ZenKraft's Great Plains Brown Bison Filed notes Bi-Fold! This one is a rugged stunner! Constructed from 4.5oz brown Bison leather, it has a semi-soft temper, and holds 4 to 6 Field Notes inserts comfortably. A sewn in 1.5" spine provides structure for elastic cords. Available April 5th on zenkraftleather.com, its the Great Plains Brown Bison Field Notes Bi-Fold, from ZenKraft!