This new bubbler pipe from Grav Labs is a really great addition to their large and varied collection of glass pipes. It is made out of high-quality glass and it is very user-friendly as well as super easy to clean. The pipe is 32mm in diameter and it comes with a built-in x-cut diffuser downstem that helps to break up the smoke and cool it down before you inhale it. The bowl on this pipe is built in and it is large and can fit about .5 of ground her inside. This pipe from Grav Labs is might not be very large but you should not let the size fool you because it delivers some very large and satisfying hits every time. I would say this pipe suits the herb smoker that really appreciates large and smooth bong sized hits on the go.