Sturdy earmuffs are designed with pivoting earcups for optimum fit. The H9A Model is a high protection design, for challenging work environments. Works with AO Tuffmaster® face protection system. • Pivoting earcups for optimum fit. • H9A Model, high protection design. • Works with AO Tuffmaster® face protection system. • Soft seal liquid/foam filled cushions for a better seal even with eyewear. Sturdy earmuffs are designed with pivoting earcups for optimum fit. The H9A Model is a high protection design, for challenging work environments. Works with AO Tuffmaster® face protection system. Ear Muff Style: Over the Head; Attenuation Rating: 24 dB; Dielectric: No; Folding: No.