much better than earplugs a good mix between the very expensive (150 €) and the first prize (€ qq). essential for a rehearsal.

Personally I sing and play guitar with no problem, I have no ears whistling after.

By against big flaw: they should be cleaned every time (I personally disinfected too) it's pretty boring but once to remove the hand it will take.
earwax accumulates it and a little itchy at times.

Indispensable for me