The Black Spiral from Grace Glass is an extremely successful piece of glass art of the Blackout series. The black and white design of the heat-resistant borosilicate glass give this bong a unique look. It has a spiral percolator that not only swirls the smoke but also filters and cools it. In addition, it has a splashguard and an icebox for extrasmoothe hits.
The bong has a 18.8 mm standard grind and the extra thick base guarantees a bombproof stand.
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