Just purchased one of these beauties on eBay.
I not as familiar with the eartip size.
looking to upgrade, any suggestions are certainly welcomed
Someone had suggested Mandarin ES Symbio wide bore?
bertrol1I strictly use Comply Isolation+ Memory Foam Tips with Waxguard, since they're the most comfortable and provide the best seal for me. And the Waxguard is priceless to me since it keeps ear wax and debris from entering the sound nozzles of my Nuforce and Westone IEM's (both size 100 nozzles) and my new CA Andromeda IEM's (size 400 nozzles). So I couldn't recommend them enough.
Comply Memory Foam Tips
https://www.complyfoam.com/store/
Just hit the "Earphone Finder" in the menu and type in Noble. Then scroll down to the Noble X!