3M Multiple Use Push-Ins Push-to-Fit Polyurethane Foam Uncorded Earplugs (1 Pair Per Poly Bag, 500 Pair Per Box)

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.