Check the listing for details. MAXIMUM Disposable Earplugs NRR33 CORDED Individually Sealed Sleep Aid 25 PAIR. Condition: New. Listed at 9.95 USD. MAX30 Disposable Earplugs NRR33 CORDED Individually Sealed Sleep Aid 25 PAIRMax Highest Attenuating Single-Use Foam Earplugs, Corded (Polycord), Individual Polybag. Workers who need to block out loud noise demand the best protection and comfort available in an earplug. That's where Max comes in. The world's most popular polyurethane foam earplug, Max offers superior noise-blocking performance in a single-use earplug. Max's enhanced contoured shape is easier to insert and resists backing out of the ear canal, while its softer foam delivers superior long-wearing comfort, delivering solid performance that your workers can depend on.World's most-used polyurethane foam earplug25 PAIRBell shape delivers maximum in-ear comfortContoured design easier to insert, resists tendency to back-out of ear canalPolyurethane foam enhances comfort, especially for long-term wearSmooth, soil-resistant closed cell-foam skin prevents dirt build-up