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Top Marble ball is 24mm
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Middle Marble Ball is 11mm
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Terp Pill is 14mm.
Terp Slurper marble set is to be used with a terp slurper banger. The terp pill sits at the bottom of the terp slurper and will spin and jump up and down. The middle marble sits on top of terp pill to keep the pill from jumping out of the bottom chamber. The top marble constricts the air flow from the top of the banger.