Pyramex Passive Pro Series Base Level PPM1 Earmuff Black. Pyramex PPM110 Ear Muff Passive Pro Foam 23 dB Over the Head Black - Specifications for Pyramex Passive Pro Series Base Level PPM1 Earmuff: Manufacturer: Pyramex Color: Black Fabric/Material: Foam NRR: 23 dB Adjustability: Adjustable Features of Pyramex Passive Pro Series Base Level PPM1 Earmuff NRR 23dB Dielectric Low profile design for maximum versatility Adjustable for custom secure fit Comfortable vented headband Soft and easy to clean ear cushions Internal foam for optimal acoustics Individually packaged Package Contents: Pyramex Passive Pro Series Base Level PPM1 Earmuff Pyramex PPM110: Passive Pro Series Base Level PPM1 Earmuff Black