Showerhead Diffusor Beaker Bong7mm Grace Glass Beaker Bong The 7mm Grace Bong is a beautifully crafted piece of glass, comes with full colour co ordination. The 7mm thick glass has a coloured rim, with marbles on the tube, the Grace Glass logo, proudly sits above the ice notches. The beaker base is half coloured and half clear through which you can clearly see the 6 arm diffusing perc downstem, as standard. The bowl goes from 18. 8mm through a reducing downtube into the built in