The standard size of a non glass on glass waterpipe is 9 mm. From Graffix to Tobacco Master, 9 mm is the standard. In these new days of glass on glass, Higher Education still offers a proper selection of these forgotten bowls. From the basic clear glass funnel bowl to the inside out fully worked bowl, there is something for everyone.Pink Wrap and RakeThick with Multi-color StringerBasic with Amber HandleSurface Worked Extra LongThick with Multi-colored StringerBasic with Yellow Stringer
