These ear muffs passively block noise by relying on the insulating materials of the ear cups to dampen sound. - They're typically worn in areas where workers don't need to speak with one another and the goal is to block all or most surrounding noise. - As the NRR of these ear muffs increases, they tend to get bulkier due to the larger ear cups and increased insulation materials. Ear Muff Style / Multi-Position Noise Reduction Rating NRR / 29 dB Dielectric / Yes Series / Viking(R) Ear Muff Cup Color / Black Standards / ANSI S3.19-1974 Ear Muff Cushion Material / Foam Ear Muff Type / Rigid Band Color - Hearing Protection / Black Band Material - Hearing Protection / Plastic Compatible Earmuff / Viking(R) V1 Multiple-Position Earmuff Compatible Mfg. Model Number / 1000365, 1006018, 1016730, 1016870, 1016871, 3302101 Replacement Pad Grainger Part Number / 36G707, 3NKX2, 6AV10 Features / Inner Ventilated Headband, Soft Ear Cushions Includes / Headband Strap Weight / 8.7 oz