3M E-A-R Push-Ins combine the easy use and benefits of a reusable earplug with the cost and comfort advantages of a disposable earplug. It’s all made possible with the innovative, simple-to-use design and the ultra-soft performance of a tip made of patented E-A-Rform foam, a derivative of the foam developed for NASA for use in their space shuttle seats.
3M (formerly Aearo) 318-1004 Multiple Use E-A-R Push-Ins Mushroom Shaped E-A-Rform Foam Uncorded Earplugs, Plastic, 1″ x 1″ x 1″ Review