The world's first foam earplugs & are still one of the most widely used earplugs today. Classic Plus earplugs are slightly longer than regular E-A-R Classic earplugs to fit deeper into the ear canal & provide higher noise reduction. 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. Recommended applications include chipping, chiseling, drilling, furnace operations, grinding, heavy equipment operations, machining, pouring / casting, power fastening, riveting, sanding, sawing & welding & more. Test compatible with the 3M E-A-Rfit Validation System. CSA Class AL. 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. Corded / Cordless: Cordless; Shape: Cylinder; Material(s): PVC Foam; Noise Reduction Rate (NRR): 33 dB.