Just want to warn other PW members not to bother buying these ear plugs if you see them.
I bought some this morning for £35, then went to my local clay ground to try them out. Well, they amplify sounds reasonably enough and don't distort too much either. However, they do not protect your ears from the gunshot! After firing 5 shots, I found myself flinching and needed to change them out for regular foam earplugs because of ringing in my ears!!!
There is no NRR rating on the packaging and now I can see why! Total waste of money!
:-(