The X-Series earmuffs are 3M's latest advancement in hearing conservation. New technologies in comfort, design and protection all come together in this groundbreaking earmuff line. The X2A is a lightweight, lower-profile earmuff designed for protection against low-to-moderate level industrial noise and other loud sounds. It features an electrically insulated wire headband, often referred to as "dielectric". The wire headband offers consistent pressure over prolonged wearing periods. Earcup pivot points tilt for optimum comfort and efficiency. , Noise Reduction Rating (NRR)b 24 dB. CSA Class A. NOTE: The X-Series (over-the-head) headband version is electrically insulated - sometimes referred to as "dielectric". The metal components of the headband have been covered by non-conductive material for use in a low voltage electrical hazard (less than 440 V ac). As there are no applicable standards for testing ear muffs against electrical insulating properties, the product has been evaluated a