Slow recovery, low pressure foam fits snugly to create a noise barrier that helps protect hearing from loud sounds. The earplugs are both flame resistant & moisture resistant. Bright yellow color allows supervisors to conduct a quick visual hearing protection compliance check. Use when exposed to noise such as in assembly & mechanical, chipping, chiseling, cleaning, drilling, furnace operations, grinding, heavy equipment operations, machining, metal repair, painting, pouring / casting, power fastening, riveting, sanding, sawing & welding & more. Test compatible with the 3M E-A-Rfit Validation System. These earplugs have a Noise Reduction Rating (NRR) of 29 dB, CSA Class AL. However, research suggests that many users will receive less noise reduction than indicated by the NRR due to variation in earplug fit, earplug fitting skill, & motivation of the user. It is recommended that the NRR be reduced by 50% to better estimate typical workplace protection. Safety Cord Helps Prevent LossOne pair per polybag. Corded / Cordless: Corded; Shape: Cylinder; Material(s): PVC Foam; Noise Reduction Rate (NRR): 29 dB.