Walkers Razor Slim Passive Ear Muffs 27 dB NRR Black. Comfort headband with metal wire frame and compact folding design. Specifications for Walkers Razor Slim Passive Ear Muffs: Manufacturer: Walkers Fabric/Material: Polymer NRR: 27 dB Size: One Size Battery Type: AAA Age Group: Adults Features of Walkers Razor Slim Passive Ear Muffs Ultra low profile ear cups Rubberized coating Compact folding design Comfort headband w/ metal wire frame Sound dampening composite housing Package Contents: Walkers Razor Slim Passive Ear Muffs Walkers GWP-RSMPAS: Razor Slim Passive Ear Muffs 27 dB NRR Black