3M™ E-A-R™ Classic™ SuperFit™ 30 Corded Earplugs, Poly Bag 311-1126 SuperFit earplugs are the only earplug model with a unique “fitting ring” to easily see when the earplug is correctly fitted. When no orange color is visible, the best fit is achieved. The red line provides a visible indication of correct fit. If the red line is visible then a correct fit has not been attained Conforms to the shape of the earcanal to help create a comfortable, snug noise barrier Slow-recovery earplug foam is flame-resistant and moisture-resistant Corded – SLC 80 22dB (Class 4)