synthetic I think. They're the kind you're not supposed to eat.

I wet these and then fill them. Fiborus is what is says they are. anyway when the sausage shrinks up a little after cooking it sticks.

Definitely try natural casings next time! I'm not even sure why synthetic casings exist -more profitable maybe? There is no need for them. People have been making summer sausage for a thousand years with no sticky casings (no Pam either!)

I agree I useally go with hog casings but my wife picked up a pack of the fibrous casing so I had to use them. I am going to try some bratwurst with my next deer.I picked up some hog casings for these.