SUREFIRE SONIC DFNDR4 MD BLK 25 PAIRThe SureFire Sonic Defender 4 earplugs in medium size and black color provide advanced hearing protection with a 24dB Noise Reduction Rating (NRR). These earplugs feature a triple flanged stem design for improved noise reduction and comfort. The patented filter allows safe sound levels to pass through while blocking harmful noises above 85dB. Made from soft, hypoallergenic polymer, they provide all day comfort, while the EarLock retention rings ensure