The 3M™ Peltor™ Hygiene Kit for Earmuffs helps to extend the life of your earmuffs and improve hygiene. The kit contains replacement sealing rings and foam inserts which can be replaced in a few easy steps.The 3M Peltor Hygiene Kit for Earmuffs HYX1 includes replaceable ear cushions and foam liners for 3M Peltor X Series X1 Earmuffs, models X1A and X1P3E (sold separately). 3M Peltor X Series X1 is a lightweight, low profile earmuff designed for protection against low level industrial noise and other loud sounds with a Noise Reduction Rating (NRR) of 22 dB. Class A. Exposure to loud noises can adversely affect the ability to hear over time. Wearing proper hearing protection devices can help in reducing the harmful effects of noise. Sound levels are expressed in decibels, often abbreviated as dB. Higher decibel numbers indicate louder sounds. Typical decibel levels associated with common sounds include: outdoors with no people or traffic 20 dB, normal conversation 60 dB, power lawn mower 90 dB, chain saw 110 dB, and 12 gauge shotgun 165 dB. The hearing protector NRR can be used to evaluate different hearing protection options. However, the actual level of protection varies depending on fit, wearing time and other factors.