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Nail quartz glass, much more resistant to heat than borosilicate, with center tube, with which you will not need to use dome. The smoke goes directly to the water chamber of your Bubbler. SG 14mm.
This '4Quartz' Oil Bowl has a central tube. Quartz glass is harder than borosilicate glass and very heat resistant.
Attention: The oil bowl must be heated only on the top, otherwise the grinding of the bong can break in cause of the expansion of the nail.
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