Just a basic, clear inline bubbler (but it's my first one ). 14mm joint, 12 slots on the diffuser. And the little guy hits like a champ. I couldn't help but take a rip out of it before pictures and it's extremely smooth. I didn't expect there to be that big of a difference, but it hits a lot smoother than my percolated bong and you can take a bigger hit. *the pictures make it look a little yellow, it's perfectly clear. I hit it once and the lighting's a little yellowish in this room.