I need a class 5 hearing protector / hearing protector with the highest protection? Our ACS Pro27 and Pro31 are AS/NZS 1270 tested class 5 hearing protectors. Class 5 is the highest class. To purchase a set go to our shop. Post navigationPrevious post: How long will it take to make my custom product ?Next post: How long will my custom earplugs or in ear monitors last?