The Spiral Boost by Grace Glass is an extremely successful piece of glass art from the OG Series. The green accents on the heat-resistant borosilicate glass give this bong its unique look. It has a spiral percolator that not only swirls the smoke but also filters and cools it. It also has a splashguard and an icebox for extra-moist hits.
The Spiral Boost has an 18.8 mm standard grind and the extra thick base guarantees a bombproof stand.
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