Zob Princess Wubbler Dab Rig This beaker style bubbler from Zob Glass gets the job done! It's approx. 9 inches tall and is 5mm thick. The princess beaker features a fixed diffused downstem for excellent percolation to your smoke. The gently angled mouthpiece features the Zob wubbler style mouthpiece. This pipe comes with an 14mm ground glass dome. Zob goes to great lengths to make each piece one of a kind, so the label you receive most likely won't be the label pictured.