6" Helix™ Hammer Bubbler in assorted colorsThe Helix hammer bubbler is 6" long and made on 32mm tubing. Its bubbler chamber features a fixed cross cut downstem that diffuses smoke through water. Its Venturi chamber mouthpiece features three air intake holes that cool and spin smoke. Two glass feet stabilize the bubbler between uses. No accessories are necessary for using this bubbler, and it functions best with approximately 0.5" of water.