Elvex BLUE Foam Ear Plugs, Un-Corded - 32 db NRR - 5 Pairs Elvex Blue has a Noise Reduction Rating of 32 dB Tested to ANSI S3.19-1974 by an independent laboratory Elvex Blue is CE certified and tested to EN-352-2 Single Number Rating (SNR) is 36 dB One size fits all!