Yellow neon earplugs seal the ear canal with soft, slow-recovery foam for excellent noise reduction and reliable hearing protection. The tapered earplugs are easy to roll down and insert, then expand within the ear canal for a comfortable, secure fit. Earplugs come in a poly bag to keep them clean prior to use. Use when exposed to noise such as in assembly and mechanical, chipping, chiseling, cleaning, drilling, furnace operations, grinding, heavy equipment operations, machining, metal repair, painting, pouring/casting, power fastening, riveting, sanding, sawing and welding and more. Test compatible with 3M E-A-Rfit Validation System. These earplugs have a Noise Reduction Rating (NRR) of 33 dB and are made of a polyurethane. 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, and motivation of the user. It is recommended that the NRR be reduced by 50% to better estimate typical workplace protection.