The 310-1250 is a yellow Uncorded Earplug seals the ear-canal with soft and slow-recovery foam for excellent noise reduction and comfort. The E-A-Rsoft™ Yellow Neons™ uncorded tapered earplug is easy to roll down and insert and then expand within the ear-canal for a comfortable and secure fit. The earplug is made up of a polyurethane. Test compatible with 3M™ E-A-Rfit™ validation system. The NRR may overestimate the hearing protection provided during typical use. 3M™ recommended reducing the NRR by 50% for estimating the amount of noise reduction provided.