From the official site:
The new ER2SE delivers clear, accurate sound using high performance dynamic drivers. The ER2SE offers Etymotic’s renowned isolation featuring a variety of eartips to provide 35dB+ of noise reduction so you will hear all the detail buried in the mix without raising the volume to compensate for ambient noise. The flat frequency response of the ER2SE will appeal to sound professionals and audiophiles alike.
Top of the E series line-up. Dynamic Driver in Stainless steel housing with MMCX connectors.
final E4000, dynamic driver in aluminium housing with MMCX connectors
Sennheiser IE 40 Pro
IE 40 Pro : Sennheiser's professional monitoring in-ear line
Nuraphone - Hear every note. Feel every beat Headphones re-invented. In + over (Inova) ear configuration. Headphones that automatically...
HIGH-RESOLUTION IN-EAR HEADPHONES WITH DUAL PHASE PUSH-PULL DRIVERS