Salted sheep casings: Grade /calibers specifications A grade: 18/20 3/14/90 7/10/90 20/22 3/14/90 7/10/90 22/24 3/14/90 7/10/90 24/26 3/14/90 7/10/90 26/28 2/16/90 B grade: 18/20 2/18/90 20/22 2/16/90 22/24 2/16/90 24/26 2/16/90 C grade : 18/20 2/20/90 20/22 2/20/90 22/24 2/20/90