It isn't a bubble but it has a chamber below the bowl of the pipe that droops down. It sort of resembles a hammer. It's just a style of pipe. My freind has one and it is pretty cool and it is great for resin hits. I would strongly suggest that if ur looking for a cool looking, resn loaded pipe, stick with a hammer. It makes a spoon look like a runt. Not to mention no shit goes in ur mouth.
sugarmagnolia Reviewed by sugarmagnolia on . what's a hammer? What is a hammer pipe? Please explain to me. Rating: 5