Oddly enough, since I started drilling out the airways on various pipes I have noticed that Vauen tends to use a much smaller diameter than most. It's quality stuff, especially for the pipes under $100, just a bit different from what you'll find on most other makers.
For what it's worth though, I didn't particularly care for the first eight months I was using the pipes before I started measuring.
For what it's worth though, I didn't particularly care for the first eight months I was using the pipes before I started measuring.