It's become a pretty common practice to apply leather or other materials to one of Joe Porper's clips to sell them as a new product. The Buck twins and David Blaine both have. The Bucks use the flat-spined model similar to the one this clip was made with, while Blaine uses the "spring spine" that is the Porper clip trademark design, with his "db" logo engraved and painted inside the spine. Porper himself never applied leather to his clips created for sale, thinking that they wouldn't hold up to repeated use very well.