Pentaconn COREIR Aluminium

Excellent

Comfortable, good sizing, pleasing sonic impact.

These eartips are comfortable, size guidance works very good and most importantly you can hear the sonic difference. I am not a big fan of microplanar tweeters because of how bright they make the sound out to be with some music genres. The brass insert in these tips adds some warmth to the overall presentation making the treble cleaner and less fatiguing. It's not a huge difference but it's enough to correct that unpleasant aspect of MPTs for me. I use them with CrinEar Meta and CrinEar Daybreak, and they are a perfect fit for the treble presentation of these sets!

A must for that little extra

These are for any audiophile who is looking for extra in their IEMs. They can change the sound of your favourite earphones, quite often for the better due to the metal core. While they don't always work, I would strongly picking up a pair.