The GRAV® Arcline Hemisphere Bubbler is 6" tall and made on 28mm tubing. Its fission downstem diffuses smoke through water and is fixed inside the pipe to prevent breakage. The beautiful flame polished GRAV® label conforms with the Arcline style, inspired by Tuscan columns from ancient Italy. The Arcline Hemisphere Bubbler comes ready to use with a 14mm Arcline Bowl and functions best with approximately 1" of water.