It looks as though both models will uphold Sennheiser’s reputation for headphone excellence.

World-renowned headphone maker Sennheiser has announced two new models for CES 2021. First, let’s take a look at the IE 300, a new in-ear headphone (IEH), featuring a refined version of the company’s 7mm Extra Wide Band (XWB) transducer, with an optimized membrane foil that minimizes natural resonances and total harmonic distortion, which is specified to be less than 0.08% at 1 kHz/94 dB.
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https://www.techhive.com/article/3602991/sennheiser-debuts-two-new-headphones-for-the-us-market.html