Grav Helix™ Hand Bubbler & Vapor straw Multi Kit 14mm - ClearGRAV 14mm Helix Multi Kit The Ultimate Modular Aeration System Experience the pinnacle of glass versatility with the GRAV 14mm Helix Multi Kit. Engineered on heavy duty 32mm borosilicate tubing, this 8 inch modular system is centered around the iconic Helix Venturi Chamber mouthpiece. Utilizing three micro air intake holes, the chamber creates a spinning "tornado" of smoke that increases surface area contact with the air, flash cooling your hits and