<https://www.head-fi.org/threads/zero-audio-zh-dx200-carbo-tenore-zh-dx210-carbo-basso-carbon-aluminium-iem-thread.665111/>
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"Dita, the answer is the first iem I've heard that come with tips of different bore sizes, and state that they change sound signature.  It's about time.  As there website states regarding the tips:\n  \n  Accessories\n  3 Pairs Small Bore Tips S/M/L..."
<https://www.head-fi.org/threads/zero-audio-zh-dx200-carbo-tenore-zh-dx210-carbo-basso-carbon-aluminium-iem-thread.665111/page-257#post-10738423>