Classic Small earplugs have a slightly smaller diameter than regular-size Classic earplugs to fit comfortably in smaller earcanals</br>Slow recovery, low pressure foam conforms to the unique shape of each ear for enhanced comfort and wearability</br>Moisture resistance helps maintain a consistent expansion time, even in humid situations</br>Noise Reduction Rating (NRR) 29 dB. CSA Class AL</br>Flame resistant for potential arc flash situations and safer storage</br></br>Product Description</br></br>3M personal protective equipment sold through Amazon's Industrial and Scientific Department is only intended for US occupational workplace use. This 3M personal protective equipment must be used in compliance with the Occupational Safety and Health Administration (OSHA) Personal Protective Equipment (PPE) standard (29 CFR 1910.132) and all other applicable health and safety standards, as well as all user instructions, warnings and limitations accompanying each product. It is essential that all product user instructions and government regulations on the use of each product be followed in order for the product to help protect the wearer.  Misuse of personal protective equipment may result in injury, sickness, or death. For correct product selection and use, individuals should consult their on-site safety professional or industrial hygienist.   For additional product information, visit www.3M.com/PPESafety.</br><br/>http://www.amazon.com/gp/product/B008MCTFUE