An enthusiast posted this amazing tip-off in Facebook. Symbio N tips are reviewed, and compared favourably to the others, including Sony Hybrid, Ortofon, Spinfits and JVC Spiral Dot. Epic article!
https://aftersoundblog.wordpress.com/2017/06/08/eartips-reviewed/
https://aftersoundblog.wordpress.com/2017/06/08/eartips-reviewed/