I get mine from Butcher Packer,, I tie the ends myself alot of folks don't but I do not want to open door of smoker and see that some how the meat came out of the casing and onto the floor of smoker,,, probably would never happen but???
Btw, where do you buy your casings at? What kind are they?
I've just bought the LEM collagen casings, but they don't have the strings at the ends.
Good luck I think you will like them,, They are good,
DS