Great alternative to expensive molds.
I've had so many of these, and lost many, but it's no issue because they are $12. They sound great when inserted correctly. I use them on stage, rehearsals, clubs, sometimes movie theaters or extended sessions. They knock down the intensity 10 or so dB, just enough especially for shrill highs, and are easily removable (i.e. for solos or ballads). There's some mud added in the low to low-mids, but it costs hundreds more for molds (which i've also lost!)