Andey Quartz Core Reactor Double Tube Rigs (14male) Go to amazon.com Related posts Top 13 best quartz banger 14mm Featurematerial:real quartzdouble tube quartz core reactorOuter dia:28mm Inner dia:17mmnice thick glass that won't break easilySturdy and packaged with care. DescriptionOuter dia:28mm Inner dia:17mm double tube creat good airflow quartz core reactor hold the heat well