Matrix (or barrel) percs are centrally positioned within the bong. Matrix percs filter the smoke like showerhead percs, pulling the smoke in through bottom holes and releasing it through the top holes. Regardless of the specific style, pieces with barrel or stereo percs perform extremely well.
CE5023WP
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CE3030WP
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CE2925WP
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CE1837WP
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CE4529WP
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CE7832WP
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CE6511WP
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CE10860WP
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KS1817WP
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