These beautiful quality leather pen cases are all double-thickness leather. There are two types. The black pen cases are made from a tough fine grain leather that is stiff enough to prove maximum protection for your pens. The Rouge Anglais, Cognac, and Chaudron cases are made from a much softer leather with a vintage patina, and a larger, more open grain. All the cases are able to accomodate even that largest of pens, up to 20mm in diameter and 160mm in length. These cases represent outstanding quality and also very good value.