The F6 shell is surprisingly durable. The resin body feels solid, and the metal nozzle is reinforced to prevent breakage. However, it is not "luxury" polished like a Campfire Audio IEM. The focus here is acoustic performance, not jewelry aesthetics.
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This is the purest way to hear the driver. It creates a wide, deep soundstage but lacks deep bass. Users often "tune" these by adding side wings (an L-shape) to reduce rear-wave cancellation. Sealed or Labyrinth Boxes: labyrinth-style bookshelf box can help extend the lower frequencies, though the is naturally "bass-light" Vintage Repurposing: lii song f6