I have found that, for the New York styledog, Sabrett’s Natural casing (Marathon Foods- New Jersey) or Thumann’s (don;t know the distributor) are best. But recently I tried grilling a skinless ona flat grill and found that for skinless the flavor and texture I best liked were from Vienna Beef. They are 100% bull meat and mahogany smoked and for some reason (probably the smoking process) when grilled on the flat-grill they seem to create a "skin" very like the natural casing – go figure. Vienna Beef comes out of Chicago.