3M E-A-R Push-Ins ear plugs combine the easy use and fit of a reusable earplugs with the cost and comfort advantages of a disposable earplug. Thermo reactive foam softens with body heat. Patented grip ring design allows plugs to gently hug the ear canal. Users do not have to roll down the foam tip, E-A-R Push-Ins are ready for use right out of the pack. You just grab the blue stem and place earplugs into ears. These plugs have a NRR 30dB. Plugs come 200 pair per dispenser.