Model Number: PEP564-1 Brand Name: Bourfu and Ecanco Key Specifications/Special Features: Meets ANSI S3.19 NRR value 27dBCE EN352-2 approval SNR value: (test result pending)Unique 4-layer cut off design enhances the sound-insulated effectFront end spatial design fits ear channel to reduce ear internal pressure for user's comfortTerminal stem molded-in nonslip use for easy insertion into ear canal

H=27, M=22, L=20, SNR=25