They are the "sport ear" as sold thru Dillon Precision. I haven't shot centerfire rifle or pistol with them yet, but can testify as to their ampification effectiveness - for example, I can now hear the primer seating into the primer pocket, and bottoming out, as well as feel it. Also, crickets and such in the back yard, and traffic a ways off - all sounds that I haven't picked up much in quite some time. The amplification is adjustable as required, from 0 to 5 times or so.
As far as the blocking function, I shot my 22 pistol in my basement range with them, using super colibri, and they blocked that. Also, I had my 7 year old son scream as loud as he can, while we were in the hallway, and they cut that out....I might start wearing them all the time.... :wink: