I guess that's true. But you're still dealing with metal threads on the nozzle. What if you over tighten them by accident? Or like mentioned above, the plastic expands/wears over time, causing the housing to not hold the nozzles very well. It would get bothersome to have to tighten the nozzles every time you were to put them on. I'm just thinking "out loud" here, but anyone please feel free to chime in. I'm new to the IEM realm (especially hybrid/tunable). I mean, considering their "lower tier" A4s were metal, and there are light metal material options. I thought it would make sense. The Big Dipper is also Acrylic-like resin right? EDIT: Changed the material of Big Dipper.