Howard Leight L3 High Attenuation Noise Blocking Earmuffs. Snap-in ear cushions make replacementquick and easy. Padded foam headband delivers longwearingcomfort with minimal pressureon the head. Three attenuation levels allow fortargeted protection for a variety ofapplications. Telescopic height adjustment remainsfixed during usage. Howard Leight L3 R03318 have a NRR Rating of 30. Package Contents: Howard Leight L3 High Attenuation Noise Blocking Earmuffs R-03318 HL-HP-R03318 Howard Leight L3 High Attenuation Noise Blocking Earmuffs R-03318