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The're about £12 but pretty good, they let a fair amount of frequencies thru and don't sound too muffled...
When I was playing in a band regularly, I'd normally just gage it at the time when deciding whether to to put them in or not... altho if a was doing a quite few rehearsals and gigs in the space of a week, then I'd normally stick em in whatever the volumes...
Altho you should do what you can to minimise it, you're gonna have to accept that you're gonna receive a certain amount of damage to you hearing over the years if you want to be involved in performing live music..