With Final Audio's Type E Series Eartips, it is possible to achieve what could be termed a perfect fit. Each eartip size is created with the optimum aspect ratio, utilizing silicon of differing rigidity for the earbud and the axis. With the optimum shape and material, the E Series reduce the feeling of forcefully inserting eartips into your auditory canal, allowing you the maximum comfort. This also allows for the true sound of your earphones to come through by heightening sound insulation, improving bass tones, and reducing any harsh tones in the high frequency range. With this expanded kit, you receive a hard case so your eartips stay organized and don't end up rolling around in a drawer. The included size adapter allows owners of IEMs with higher gauge nozzles to access the quality of Final's E-Series tip. Made for Final Audio earphones. COMPATIBLE WITH: 1More, 64 Audio, AAW, AKG, Astell & Kern, Audio-Technica, Beats by Dre, Beyerdynamic, BGVP, Campfire Audio, Denon, DUNU, Empire Ears, Fearless Audio, FiiO, HiFiMan, Jabra, Jerry Harvey (JH Audio), JVC, Kinera, KZ Audio, MEE Audio, Meze Audio, Monster Noble Audio, RHA, Shanling, Shure, Sony, Strauss & Wagner, Tin Audio, Westone and more