Willber
1000+ Head-Fier
I presume you mean the EMX500? MX500 is the generic shell (based on the original Sennheiser MX500) used by many sellers - including your Fengru Silver!Must have imo at this price. I prefer them over MX500 but its my taste, prefer the sweet immersive vocal of Fengru Silver.
They do like to make things confusing.