These heavy gauge stainless steel bowls/screens are so good that I've designed wooden hand carved pipes with a 3/4" (ID) brass washer affixed ready to fit them. They fit perfectly in the small silicone jars sold herein also. So, you can pack several bowls, pop them into the jars, and you have a variety in your stash pouch for the day. When they get dirty, just drop them into a jar of Isopropyl alcohol to soak for 24 hours. They wipe clean with a paper towel and will last a lifetime. These little gems have revolutioned my whole approach to smokin a pipe. I sell the pipes as art pieces for a couple of hundred each with two extra screens in the silicone jars and folks love them.