I had gotten a set of 4 tubes elsewhere, but the smallest size wasn't small enough for what I wanted. I needed one with a smaller base to fit my old cast iron suffer, and found this one. The wall thickness is also nearly double the others I purchased, so I know it will hold up to plenty of use. I haven't had a chance to use it yet, but this size is definitely small enough for my 19mm casings. Now I just hope my stuffer can build enough pressure to get the meat out. :). Fortunately, I did also get a plastic insert for the stuffer to ensure a tight seal, so it should be good.