black pyroclastic horse culatta one piece leather card casethe card case has been hand cut from a butter soft full grain washed and tumbled 2. 3mm vegetable tanned matte black horse culatta leather. culatta is a special cut combined of the rear just above the cordovan, the belly middles and the hind shanks, offering a dense structure, tight grain and medium to firm temper. the leather features a pyroclastic treatment adding layers of texture slowly built up over 14 days, depicting fragments of rock erupted